BBB gpio symlinks

## symlinks created by this udev rule: https://pastebin.com/MMC6u7pR
## when using cape-universal (enabled by default) on a beaglebone:

@beaglebone:~$ ls -ld /dev/gpio/*
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_03 -> /sys/class/gpio/gpio38/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_04 -> /sys/class/gpio/gpio39/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_05 -> /sys/class/gpio/gpio34/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_06 -> /sys/class/gpio/gpio35/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_07 -> /sys/class/gpio/gpio66/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_08 -> /sys/class/gpio/gpio67/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_09 -> /sys/class/gpio/gpio69/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_10 -> /sys/class/gpio/gpio68/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_11 -> /sys/class/gpio/gpio45/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_12 -> /sys/class/gpio/gpio44/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_13 -> /sys/class/gpio/gpio23/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_14 -> /sys/class/gpio/gpio26/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_15 -> /sys/class/gpio/gpio47/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_16 -> /sys/class/gpio/gpio46/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_17 -> /sys/class/gpio/gpio27/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_18 -> /sys/class/gpio/gpio65/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_19 -> /sys/class/gpio/gpio22/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_20 -> /sys/class/gpio/gpio63/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_21 -> /sys/class/gpio/gpio62/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_22 -> /sys/class/gpio/gpio37/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_23 -> /sys/class/gpio/gpio36/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_24 -> /sys/class/gpio/gpio33/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_25 -> /sys/class/gpio/gpio32/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_26 -> /sys/class/gpio/gpio61/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_27 -> /sys/class/gpio/gpio86/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_28 -> /sys/class/gpio/gpio88/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_29 -> /sys/class/gpio/gpio87/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_30 -> /sys/class/gpio/gpio89/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_31 -> /sys/class/gpio/gpio10/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_32 -> /sys/class/gpio/gpio11/
lrwxrwxrwx 1 root root 21 Sep 14 23:20 /dev/gpio/P8_33 -> /sys/class/gpio/gpio9/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_34 -> /sys/class/gpio/gpio81/
lrwxrwxrwx 1 root root 21 Sep 14 23:20 /dev/gpio/P8_35 -> /sys/class/gpio/gpio8/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_36 -> /sys/class/gpio/gpio80/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_37 -> /sys/class/gpio/gpio78/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_38 -> /sys/class/gpio/gpio79/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_39 -> /sys/class/gpio/gpio76/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_40 -> /sys/class/gpio/gpio77/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_41 -> /sys/class/gpio/gpio74/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_42 -> /sys/class/gpio/gpio75/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_43 -> /sys/class/gpio/gpio72/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_44 -> /sys/class/gpio/gpio73/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_45 -> /sys/class/gpio/gpio70/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P8_46 -> /sys/class/gpio/gpio71/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_11 -> /sys/class/gpio/gpio30/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_12 -> /sys/class/gpio/gpio60/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_13 -> /sys/class/gpio/gpio31/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_14 -> /sys/class/gpio/gpio50/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_15 -> /sys/class/gpio/gpio48/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_16 -> /sys/class/gpio/gpio51/
lrwxrwxrwx 1 root root 21 Sep 14 23:20 /dev/gpio/P9_17 -> /sys/class/gpio/gpio5/
lrwxrwxrwx 1 root root 21 Sep 14 23:20 /dev/gpio/P9_18 -> /sys/class/gpio/gpio4/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_19 -> /sys/class/gpio/gpio13/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_20 -> /sys/class/gpio/gpio12/
lrwxrwxrwx 1 root root 21 Sep 14 23:20 /dev/gpio/P9_21 -> /sys/class/gpio/gpio3/
lrwxrwxrwx 1 root root 21 Sep 14 23:20 /dev/gpio/P9_22 -> /sys/class/gpio/gpio2/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_23 -> /sys/class/gpio/gpio49/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_24 -> /sys/class/gpio/gpio15/
lrwxrwxrwx 1 root root 23 Sep 14 23:20 /dev/gpio/P9_25 -> /sys/class/gpio/gpio117/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_26 -> /sys/class/gpio/gpio14/
lrwxrwxrwx 1 root root 23 Sep 14 23:20 /dev/gpio/P9_27 -> /sys/class/gpio/gpio115/
lrwxrwxrwx 1 root root 23 Sep 14 23:20 /dev/gpio/P9_28 -> /sys/class/gpio/gpio113/
lrwxrwxrwx 1 root root 23 Sep 14 23:20 /dev/gpio/P9_29 -> /sys/class/gpio/gpio111/
lrwxrwxrwx 1 root root 23 Sep 14 23:20 /dev/gpio/P9_30 -> /sys/class/gpio/gpio112/
lrwxrwxrwx 1 root root 23 Sep 14 23:20 /dev/gpio/P9_31 -> /sys/class/gpio/gpio110/
lrwxrwxrwx 1 root root 22 Sep 14 23:20 /dev/gpio/P9_41 -> /sys/class/gpio/gpio20/
lrwxrwxrwx 1 root root 21 Sep 14 23:20 /dev/gpio/P9_42 -> /sys/class/gpio/gpio7/
lrwxrwxrwx 1 root root 23 Sep 14 23:20 /dev/gpio/P9_91 -> /sys/class/gpio/gpio116/
lrwxrwxrwx 1 root root 23 Sep 14 23:20 /dev/gpio/P9_92 -> /sys/class/gpio/gpio114/