vboot: Update to most recent GBB flag usage

This patch changes the GBB flag configuration to the latest usage in
upstream vboot (as of https://chromium-review.googlesource.com/976660).

Change-Id: I585d662d7de34b4964d028e3d06b4df5665fbe9e
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/25346
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2 files changed