security/vboot: Add function to check if UDC can be enabled

Add a function that will check the various requirements to
enable USB Device Controller (UDC):

- developer mode enabled
- GBB flag set or VBNV flag set

If VBOOT is not enabled, then default is to allow UDC enabling.

BUG=b:78577893
BRANCH=poppy

Change-Id: Id146ac1065f209865372aeb423f66ae734702954
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/25847
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2 files changed