Sound Control: Misc clean up for newer WCD9xxx SOCs

Bump driver version to 3.4

Change-Id: Ic3402b8ce2a5b9ca155564582f8d824a7eff1fd0
Signed-off-by: Paul Reioux <reioux@gmail.com>
Signed-off-by: flar2 <asegaert@gmail.com>