ASoC: msm: Support multi channel volume in compressed driver

In compressed driver volume is applied to only left and right
channels in case of multichannel playback. Add support to
apply the volume to other channels such as center, left surround,
left rear surround, right surround and right rear surround
channels if available.

This change is a port of Ib8a4c1051e2d1505ca680de8a28b7f25d5d23000

CRs-Fixed: 766193
Change-Id: I1426bb71ca125e691d3ef71d672e4a2bf4d58211
Signed-off-by: Haynes Mathew George <hgeorge@codeaurora.org>