msm: Add device tree support for audio drivers

Add device tree support to sound soc audio drivers.
These drivers get registered to the alsa framework
and thus aid detection of soundcard.

Change the device tree entries to follow the new
design approach of having individual probe functions
for each audio interface.

Change-Id: Ie8f0bddd5ba6e2cfb66c6a23efdcb434c5082d7d
Signed-off-by: Phani Kumar Uppalapati <phanik@codeaurora.org>