sb/intel/common/firmware: Don't touch descriptor region
This patch makes the way to protect flash regions selectable. If you
don't want to use ifdtool for modification of flash descriptor, enable
the new option. Otherwise, the previous config settings for all
mainboards will be retained.
Change-Id: I46ec6339008edcc78fe76682eed5714f85354937
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/31639
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>