Add a battery command.

This adds a "mosys battery" command along with subcommands to print
and set first use date information (to be implemented in platform
code).

BRANCH=none
BUG=chrome-os-partner:13108
TEST=manual, verify battery fud commands on Stout platform (future commit).

Change-Id: I41ff59291463d7bdb70a0f45e5b956f8b62d230a
Reviewed-on: https://gerrit.chromium.org/gerrit/39694
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Commit-Ready: Shawn Nematbakhsh_ <shawnn@chromium.org>
Reviewed-by: Shawn Nematbakhsh_ <shawnn@chromium.org>
Tested-by: Shawn Nematbakhsh_ <shawnn@chromium.org>
4 files changed