[AUDIO] Added handling of incall headset audiopath.

Change-Id: I809bd3386271d0c694137119c0cd03b345fe4654
[AUDIO] SetVolume correction

Change-Id: Ifb1a821d06d083bfac94932e43c31d30f19623c3
[AUDIO] Added SRS_SND_PCM_IF_CTRL packet. Thanks to Rebellos

Change-Id: I7d02eca7f626b5b4121372666eb16a0e7c71ebbc