[ofw] RE: Patch to support boot disk

[Sean Hefty]

>In order to support boot from IB, we need to make all the drivers to be boot
>driver. Also registry "StaticChild" should not be changed after driver update
>if it's modified. Please review the patch.

Winverbs and winmad are upper filter drivers that export calls to userspace.
They shouldn't be required to boot over IB.  The change itself looks harmless to
me though.