servo: Have each ina entry specify the INA type

poppy is going to have a mix of INA3321 an INA219, so we want to
specify the INA type for each entry.

Also, this simplifies the Makefile quite a bit.

BUG=chrome-os-partner:61566
TEST=Comment out "Autogenerated" line in generate_ina_controls.py,
     check that /usr/lib64/python2.7/site-packages/servo/data files
     are identical with and without this patch.

Change-Id: Ia1919fca50b14fb15b575df4e9a84721a3a79958
Reviewed-on: https://chromium-review.googlesource.com/427530
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
52 files changed