devctl freeze/thaw

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devctl freeze/thaw

Warner Losh
I've started a code review for devctl freeze/that

https://reviews.freebsd.org/D16735

This is needed to fix the races when multiple drivers match. Today we have
some ugly workarounds that work (for most people) for USB. This also
removes them.

Comments please. This implements the freeze/thaw that was talked about at
BSDcan 2018 and in various other forums...

Warner
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