Add component probing for batteries.

This produces values like:

'SAMSUNG Electronics Li-ion 5520000'
'ASUS X101 Li-ion 2600000'

TEST=Run gft_hwcomp.py and observe value for part_id_battery.
BUG=chrome-os-partner:6225

Change-Id: Ie8ceda73cf42bb8ef904590a8a3258b9a065ba3e
Reviewed-on: http://gerrit.chromium.org/gerrit/8781
Reviewed-by: Jay Kim <yongjaek@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Ready: Dave Parker <dparker@chromium.org>
Tested-by: Dave Parker <dparker@chromium.org>
1 file changed