Faux's Sound Control: Sound control for WCD93xx codec

w/ sound_control_gpl.c update

Fully GPL'ed version.

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

Cherry-pick from SGH-Krait

https://github.com/faux123/SGH-Krait/commit/42f9ed38af07ace0d78f120d6eac09dfffed034d
https://github.com/faux123/SGH-Krait/commit/4f6c9c3269ae97a71877e81f8e456036cb283c51

Thank you @Faux123