CRAS UCM: Enable flag be added in UCM config

Parse flag name specified in verb section of UCM config.
This will enable turning on/off a feature per platform.

BUG=chromium:267355
TEST=Unittest

Change-Id: Id04bfe5c4f94e62a11b88131d51c44d230ea4601
Reviewed-on: https://gerrit.chromium.org/gerrit/65583
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
Tested-by: Hsinyu Chao <hychao@chromium.org>
Commit-Queue: Hsinyu Chao <hychao@chromium.org>
3 files changed