audio: Send correct channel count for voice call recording

-Using popCount function to get channel count gives incorrect
 value on voice call recording.
-Only STEREO/MONO/5.1 bits to be considered to valid count
 channels on input.

CRs-fixed: 447072
Change-Id: I8c623308d3e9619055bc3b85e7b386a97eb7623d
Merge "audio: Send correct channel count for voice call recording"