ASoC: msm: qdsp6v2: Add session specific volume and mute control

Update volume and mute control to make it session specific.
Add functionality to handle all sessions for HALs that are not session
specific.

Change-Id: Ic55d3d69c9d4955e5e1d19929a97deecf54a43f9
Signed-off-by: Pradnya Chaphekar <pradnyac@codeaurora.org>

Conflicts:
	sound/soc/msm/qdsp6v2/msm-pcm-voice-v2.c
	sound/soc/msm/qdsp6v2/q6voice.c