Peter Grehan 598b1345d9 Allow PCI VGA devices to be detached.
GPUs often have a VGA PCI class code and are probed/attached
by the VGA driver. Allow them to be detached so they can
be presented as passthru devices to VM guests.

Submitted by:	mmacy
Reviewed by:	jhb, imp, rgrimes
MFC after:	3 weeks
Differential Revision:	https://reviews.freebsd.org/D15269
2018-05-03 22:51:44 +00:00
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