ARM: dts: msm: Add support for audio ETM for SDM845

Add audio ETM configuration to the device tree for sdm845.
This device will be used to capture HW events on audio
sub-system.

Change-Id: I4aab70962933e46d4a0163a4bbd1e2f87d7caacc
Signed-off-by: Satyajit Desai <sadesai@codeaurora.org>