labstation: servo reboot and update

Reboot servo v4 on servod restart or reboot.
This keeps the servo firmware up to date and
ensures fresh state on the servo for a servod restart.

BUG=b:69016505
TEST=clobbered Cassandra lab labstation, booted with delay and update

Change-Id: I763d0d2be70f5d9f4272e54400192799cce25fd4
Reviewed-on: https://chromium-review.googlesource.com/1068154
Commit-Ready: Nick Sanders <nsanders@chromium.org>
Tested-by: Nick Sanders <nsanders@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@google.com>
Reviewed-by: Congbin Guo <guocb@chromium.org>
2 files changed