sign_official_build.sh: consistent format loem.ini

sign_official_build.sh accepted a subset of the syntax allowed by
sign_firmware.sh.  Update to be consistent.

BUG=chromium:962529
BRANCH=None
TEST=Manually verified

Change-Id: Ic9c7d5d8a4744c09c06249ed835ef678e6368aa0
Reviewed-on: https://chromium-review.googlesource.com/1612376
Commit-Ready: LaMont Jones <lamontjones@chromium.org>
Tested-by: LaMont Jones <lamontjones@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Jason Clinton <jclinton@chromium.org>
1 file changed