ASoC: msm: Add Kcontrol to enable compressed playback on HDMI

Expose kControl for playing the compressed Content over HDMI.
Kcontrol exposed is for the LPCM and also compressed.
Usage - application has to set this kcontrol
for any playback over HDMI.

Change-Id: I424611fc964896c72afad1c3987a002a630e43d9
Signed-off-by: Aviral Gupta <aviralg@codeaurora.org>