svgroot.setAttribute("aria-hidden", "true");

svgroot.setAttribute("aria-hidden", "false");

<button class="slds-button slds-button--icon slds-button--icon-border" onclick="{!c.updateProduct}">
                        <c:svgIconSample class="slds-button__icon" svgPath="/resource/SLDS/assets/icons/utility-sprite/svg/symbols.svg#check" category="utility" size="medium" name="ProductUpdate"/>
                         <span class="slds-assistive-text">Update</span>
                     </button>
                     <button class="slds-button slds-button--icon slds-button--icon-border" onclick="{!c.clear}">
                        <c:svgIconSample class="slds-button__icon" svgPath="/resource/SLDS/assets/icons/utility-sprite/svg/symbols.svg#close" category="utility" size="medium" name="ProductClose"/>
                         <span class="slds-assistive-text">Remove</span>
                     </button>