audio:add support for mono speaker

audio:add support for mono speaker

BZ: 23041

This patch adds support for mono speaker configuration
using runtime sst params.

If particular board has mono speaker, kernel config
SND_MFLD_MONO_SPEAKER_SUPPORT needs to selected to enable
the mono speaker support.

Change-Id: I3084772106669c129c426981c140b60afe658d41
Signed-off-by: Ramesh Babu K V <ramesh.babu@intel.com>
Reviewed-on: http://android.intel.com:8080/36911
Reviewed-by: Koul, Vinod <vinod.koul@intel.com>
Reviewed-by: Gupta, ArvindX K <arvindx.k.gupta@intel.com>
Reviewed-by: Hibare, PramodX <pramodx.hibare@intel.com>
Tested-by: Hibare, PramodX <pramodx.hibare@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>