labstation: Apply cambrionix firmware

Add an init script to run the upgrade - noop if no update needed.

BUG=b:278585904
TEST=local build of labstation - verified logs on boot
Cq-Depend: chromium:5834665
Change-Id: I0c3024e72974adfa1b213f662445bf27367dd591
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/labstation/+/5835055
Tested-by: Keith Haddow <haddowk@chromium.org>
Commit-Queue: Garry Wang <xianuowang@chromium.org>
Reviewed-by: Garry Wang <xianuowang@chromium.org>
Commit-Queue: Keith Haddow <haddowk@chromium.org>
Auto-Submit: Keith Haddow <haddowk@chromium.org>