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: Id79ca428b311dda90467155611af3e2a0fff1fcf
Acked-by: Devender Kaushik <dkaushik@qti.qualcomm.com>
Signed-off-by: Mohammed Nayeem Ur Rahman <mohara@codeaurora.org>