vboot: Use stage_exit() on ARM

Long term we should unify ARM and x86 handling of situations like this.

Signed-off-by: Stefan Reinauer <reinauer@google.com>

BRANCH=none
TEST=needs further changes
BUG=none

Change-Id: Iac598234262264117553c8ce915ddcb7fcc6509e
Reviewed-on: https://chromium-review.googlesource.com/167402
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: Stefan Reinauer <reinauer@google.com>
Commit-Queue: Stefan Reinauer <reinauer@google.com>
1 file changed