Sound Control: (Optional) work around for Nexus 4/5 audio issues

(Use this only for devices with audio reset issues)

Also bump version to 3.1

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

wcd9xxx-core: add register write without mutex protection

This is assuming the calling function will take care of the mutex.

Signed-off-by: Paul Reioux <reioux@gmail.com>
Sound Control: (OPTIONAL) add power amp registers access control as well

Signed-off-by: Paul Reioux <reioux@gmail.com>
sound control: add register cache

bump to version 3.2

Signed-off-by: Paul Reioux <reioux@gmail.com>
Sound Control: expose direct register manipulations to userspace

bump driver version to 3.3

Signed-off-by: Paul Reioux <reioux@gmail.com>
Sound Control: Misc clean up for newer WCD9xxx SOCs

Bump driver version to 3.4

Signed-off-by: Paul Reioux <reioux@gmail.com>
Sound Control: let register lock be dependent on different hw revisions

Signed-off-by: Paul Reioux <reioux@gmail.com>
Sound Control: separate locking mechanism for recording and playback

with newer hardware revisions coming from Qualcomm, single register lock
control isn't sufficient to cover both playback and recording usage scenarios

bump to version 3.5

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