audio: Exposed LPE Mixer controls for the HAL to select the Mixer required

audio: Exposed LPE Mixer controls for the HAL to select the Mixer required
based on the sink device

BZ: 26104

Added support for device pipeline configuration by exposing LPE Mixer
elements as ALSA mixer controls.
To add support in SOc for add platform controls, following alsa patchs
 are applied
1. 0001-ASoC-core-Add-API-call-to-register-platform-kcontrol
2. 0002-ASoC-core-Make-platform-probe-more-like-codec-probe

Change-Id: I01b829294f82753496f06a5df05afec4c48384b7
Signed-off-by: KP, Jeeja <jeeja.kp@intel.com>
Reviewed-on: http://android.intel.com:8080/40136
Reviewed-by: Koul, Vinod <vinod.koul@intel.com>
Tested-by: M, Arulselvan <arulselvan.m@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>