image_signing: drop board hacking for lsb appid checks

BUG=chromium:605595
TEST=None
BRANCH=None

Change-Id: I8104d80d151440bdd8f419c88bd98592d9f44612
Reviewed-on: https://chromium-review.googlesource.com/371678
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
1 file changed