MFC of r263873.

Pointed by:     Ivan Klymenko <fidaj@ukr.net>

Sponsored by:	The FreeBSD Foundation
Temporary disable build of vt_efifb vt(4) driver, not all parts of UEFI support
here yet.
This direct commit to STABLE-10, because HEAD already support UEFI FB.

Sponsored by:	The FreeBSD Foundation