Video recording with Front Camera is using the BACK side DMIC for audio capture.

Now AudioPolicyManagerBase will retrieve the camera facing direction from the
system property "media.camera.facing" and select the correct mic to use when
input source is AUDIO_SOURCE_CAMCORDER, default will be the built in mic.

Change-Id: I3f46424aeebe1cf076e7b00c0c22d45f3d713edf
Author: Gurudatta Bhakte <gurudattax.bhakte@intel.com>
Signed-off-by: Gurudatta Bhakte <gurudattax.bhakte@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 33137