Stout: Add support for new battery first-use-date commands.

Stout needs the ability to set battery first-use-date. Add
first_use_date print/set commands.

TEST=manual, mosys battery {print,set} fud on Stout.
BUG=chrome-os-partner:13108
BRANCH=none

Change-Id: I3af0c7612c632a937cf328d46e156bb430aff0b0
Reviewed-on: https://gerrit.chromium.org/gerrit/39639
Commit-Ready: Shawn Nematbakhsh_ <shawnn@chromium.org>
Reviewed-by: Shawn Nematbakhsh_ <shawnn@chromium.org>
Tested-by: Shawn Nematbakhsh_ <shawnn@chromium.org>
5 files changed