vboot_api: Add new VB_AUX_FW_NO_DEVICE update severity

There is a possibility that a registered device is not present at
run-time and this scenario needs to be handled a little different. Add a
new update severity to handle this situation.

BUG=chromium:896451
BRANCH=None
TEST=bootup to ChromeOS by connecting and disconnecting the USB
daughterboard

Change-Id: I8a2044ce6a10fe611ee1f47262a7b54598a53ce3
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1299993
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Jett Rink <jettrink@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/1352629
Reviewed-by: Martin Roth <martinroth@chromium.org>
Tested-by: Martin Roth <martinroth@chromium.org>
1 file changed