arm/dt: msmcopper: Add audio devices support

Add device tree nodes for audio drivers for
copper target. These device nodes are required
to register sound soc audio and cpu drivers
with alsa framework.

Change-Id: I479e63d23bb13e9dd8ad02f7ca6af61d8acaf8ea
Signed-off-by: Phani Kumar Uppalapati <phanik@codeaurora.org>