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>
Change-Id: I18b768d6891b8af232a4c4468fd45c98921d161e
Sound Control: (OPTIONAL) add power amp registers access control as well

Signed-off-by: Paul Reioux <reioux@gmail.com>
Change-Id: I5b4f9ddb039667059fb5643a4779dd0315e124d0
sound control: add register cache

bump to version 3.2

Signed-off-by: Paul Reioux <reioux@gmail.com>
Change-Id: I64333c871760e0bd36ee261bb7622611150de830