ASoC: msm: Add volume support for Multimedia5

Add support for controlling pcm audio volume in DSP through
Multimedia5. Add TLV mixer control to set the pcm stream volume

Change-Id: Ie5f50c4f47ea57fe4be0aef1320c79a9d3fe7600
Signed-off-by: Subhash Chandra Bose Naripeddy <snariped@codeaurora.org>
Merge "ASoC: msm: Add volume support for Multimedia5" into jb4.2