On UEFI machines you'd prefer fbdev to grab efifb instead of vesa trying
to initialize and failing in a way we can't unwind from. On BIOS
machines this is harmless: either there is an fbdev driver and it'll
probably be more capable, or there's not and vesa will kick in anyway.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Adam Jackson <ajax@redhat.com>