speaker amp control: initial release for speaker amp control

Signed-off-by: faux123 <reioux@gmail.com>
speaker amp control: allowed all configurable registers to be adjusted

Signed-off-by: faux123 <reioux@gmail.com>
Sound Control: Sound control for WCD93xx codec

Fully GPL'ed version.

Signed-off-by: faux123 <reioux@gmail.com>