Add dumb fey battery driver
renamed to twl4030_madc_battery; added platform data to specify full capacity in uAh

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
moved capacity and voltage/fill-level tables to platform data in board file; fixed minor issues

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>