ASoC: msm: Add supplementary service for VoLTE and voice call on 8974

Add support for call hold and resume for Voice and VoLTE calls.
This is added to support the pause and resume events from user space
for voice driver. These events are used to switch between Voice and
VoLTE calls. These events are handled in trigger function of
driver which puts vocproc to standby mode for pause and starts
when resume is passed to trigger function of driver.

Change-Id: Id81600df28cb676766847d21bdd9000c8cbb1c3d
Signed-off-by: Helen Zeng <xiaoyunz@codeaurora.org>