ARM: msm: dts: Enable support for audio tunneling mode for msm8996

It is required to pass usb-audio-qmi-dev device node from dtsi to
provide StreamID and interrupt number info so that this info will be
used for enabling for USB audio tunneling mode over USB. Hence add
the node to enable audio tunneling mode for msm8996.

Change-Id: Iba4d18ff0495460f5d488604f31c4d5209252940
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>