Sound Control: Added headphone poweramp controls

bump version to 2.1 to reflec this new addition

Signed-off-by: Paul Reioux <reioux@gmail.com>
sound control 3.x: Initial GPL release for WCD9310 Audio Codec

This is first official GPL release based on my private implementation.

This release has been tested for Mako and Flo officially.  It may work
with other devices using the same WCD9310 Audio Codec as well, but not tested

Signed-off-by: Paul Reioux <reioux@gmail.com>
sound control: wip: change mic gain register

Signed-off-by: Paul Reioux <reioux@gmail.com>