ARM: dts: msm: add remote debugger support on Lagoon

Add remote debugger device configuration. The Remote Debugger driver
allows a debugger running on a host PC to communicate with a remote
stub running on peripheral subsystems.

Change-Id: I571ffe723699e4058c2f70b85fa4efb0aa4b4a7e
Acked-by: Devender Kaushik <dkaushik@qti.qualcomm.com>