ARM: dts: msm: add coresight gfx support on sdm670

Add device tree support for coresight gfx funnels
on sdm670. The device will be used to capture debug
information from GFX module.

Change-Id: I700bb6f793b44062589a5190e959e10cf8c0a8aa
Signed-off-by: Saranya Chidura <schidura@codeaurora.org>