uart_cpu_eqres for FDT

Index: uart_cpu_fdt.c
===================================================================
--- uart_cpu_fdt.c      (revision 257107)
+++ uart_cpu_fdt.c      (working copy)
@@ -86,7 +86,13 @@
 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
 {

-       return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
+       if (b1->bst != b2->bst)
+               return (0);
+       if (pmap_kextract(b1->bsh) == 0)
+               return (0);
+       if (pmap_kextract(b2->bsh) == 0)
+               return (0);
+       return ((pmap_kextract(b1->bsh) == pmap_kextract(b2->bsh)) ? 1 : 0);
 }

 int