Asoc: msm: 8064: Set channel as Mono for Incall Music Delivery

For incall music delivery, there is only one share channel is
supported between MDM and APQ. If the media is stereo, afe tries to
open two share channels and causes music playback failure.
Add fixup fucntion to always set the channel as 1 whenever the media
is stereo or mono. And make sure only one share channel is opened.

(cherry picked from commit 548741eb8164c54197d2625120481dd1b51242d1)

Change-Id: I3b2b9a4d3be69797fa2e6f3a507cf360dcf1f22c
CRs-Fixed: 398100
Signed-off-by: Helen Zeng <xiaoyunz@codeaurora.org>
Signed-off-by: Jessica Gonzalez <jgaona@codeaurora.org>