arm/dt: msm8226: Add support for incall LCH tone playback

Add incall local call hold tone playback device
required for delivering LCH tone to the farside.
A seperate device is required in device tree for
each different voice session/subscription.

Change-Id: I7c39e8d6725fa7b04d669826ead0e1bbe98ac944
Signed-off-by: Vicky Sehrawat <vickys@codeaurora.org>