EMPTY_WRAP() might be useful for tests other than CBFS's ones. Move it
to the main tests header file to make it easily accessible.
Change-Id: Ic06c55912488681daf6d2c48cb0c879fa97ba4be
Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60971
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>