ASoC: msm: Update the correct channel count for dolby configuration

Wfd supports both 5.1 and stereo pcm playback. Add the dolby
configuration for 5.1 playback on wfd.

CRs-Fixed: 609429
Change-Id: I6727ca1a4825bf64e48f211ca9d270f661ceedf0
Signed-off-by: Krishnankutty Kolathappilly <kkolat@codeaurora.org>