fw-zephyr: Support led states and power output enable in gpio cmd

BUG=None
TEST=verify correct output when changing states.

Change-Id: Ie240686110a184cc7d52b5839f5c231c85467ec7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dolos/+/5465583
Reviewed-by: Samuel Jacob <samjaco@google.com>
Commit-Queue: Samuel Jacob <samjaco@google.com>
Tested-by: Samuel Jacob <samjaco@google.com>
Reviewed-by: Udaya Kiran Ammu <udaykiran@google.com>
Owners-Override: Hsin-Yi Wang <hsinyi@chromium.org>
7 files changed