msm: rdbg: Add snapshot of remote debugger driver

The Remote Debugger driver allows a debugger running
on a host PC to communicate with a remotestub running
on peripheral subsystems.

This snapshot was taken as of msm-3.10 commit
("Merge "msm: msm_bus: Provide valid input pointer argument")

Change-Id: I944c298446d3786cb6fde20e4b2edaf02ce8e6f1
Acked-by: Chenna Kesava Raju <chennak@qti.qualcomm.com>
Signed-off-by: Tharun Kumar Merugu <mtharu@codeaurora.org>