Also make most significant bit function accessible outside the scope
of this file.
Change-Id: I3ab39d38a243edddfde8f70ebd23f79ff774e90e
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/18320
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>