btfm: Program multi channel registers in wcn3990 for Tx/Rx

For A2DP/SCO Rx, SCO/FM Tx use cases, we need to program
multi channel registers. Without this there would be
glitches and random silence during A2DP playback.

While at it, add the function name to the debug print macro.

CRs-Fixed: 2027268
Change-Id: Ia8e5fde48bb94e97346fe323e92dc32ed60b0e65
Signed-off-by: Satish Kodishala <skodisha@codeaurora.org>