ARM: dts: msm: Add CDSP rpmsg entry for trinket

CDSPRM communicates with CDSP based on the rpmsg driver. The device
tree entry configures CDSPRM module of FastRPC based AQoS feature
and enables thermal mitigation for CDSP subsystem.

Change-Id: I81f7398fa6cf3f554be23f63639443d9b4f60853
Acked-by: Sreekanth Gande <sgande@qti.qualcomm.com>
Signed-off-by: Tharun Kumar Merugu <mtharu@codeaurora.org>