ARM: dts: msm: Add audio device for mpq8092

Update the mpq8092 device tree to add the audio specific devices.
Add the HDMI slimbus device in the device tree for the wcd codec.
Add the adsp loader device for loading the ADSP.
Add the memory bindings for the audio device.

Change-Id: I153a59a7ae4b24ca2121eb9266727c6595e18f66
Signed-off-by: Aviral Gupta <aviralg@codeaurora.org>