ASoC: msm: Add support for AC3 pass through playback

Add support for AC3 tunnel mode playback where dsp acting
As pass through.

Change-Id: Ibc6536a439f7cae8cbbadcaddd4ad27e4ee84543
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>
Signed-off-by: Hieu Phan <aznrice2k4@gmail.com>