ASoC: mdm9625: Add support for primary AUX PCM

Primary AUX PCM support is needed when codec is not used.
Add backend DAIs to machine driver.  Multiplex GPIOs for
primary AUX PCM.  Update 9625 device tree.

Change-Id: If56c28d3a93cbc918d288fbb11e8b8225ce85055
Signed-off-by: Prashanth Reddy <pgreddy@codeaurora.org>
2 files changed