Remove dead video.asl

Change-Id: Iadaa6172347ebb7d367d1faa6ed9462fff07d7e6
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6730
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>