ASoC: msm: Add incall recording support

Add two backend DAIs, and add two mixer controls to route
capture stream to the new backend DAIs. Start/stop record
commands will be sent to CVD if starting/stoping recording,
after voice call is established.

Change-Id: Iabff5390ca8c50ba05ae2dfa31fa3f1a8797f1db
Signed-off-by: Helen Zeng <xiaoyunz@codeaurora.org>
9 files changed