ASoC: WCD9306: Add initial driver for WCD9306 codec

Add codec driver for WCD9306. WCD9306 is a superset for
WCD9302 codec. Same driver will be used for both WCD9302
and WCD9306. The codec driver is ALSA compliant.

Change-Id: I50a098883de657d7272a084ede8fbd16ed03f2c4
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>
6 files changed