Merge ^/head@262809

Sponsored by:	The FreeBSD Foundation
Undo lib/libstand Makefile changes on UEFI branch

32- and 64-bit versions of libstand are now built under sys/boot for
bootloaders; changes to the version in lib are not required.

Sponsored by:	The FreeBSD Foundation
Temporarily remove vt_vga from UEFI VT config

Prioritization of early console drivers is not yet supported properly,
so allow only efifb to claim the console and keyboard.