src/mb: Fix non-local header treated as local

Also remove some unnedded includes.

Change-Id: I036208a111d009620d8354fa9c97688eb4e872ad
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/27129
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
60 files changed