msm: rdbg: Add snapshot of remote debugger driver

This snapshot was taken as of msm-3.10 commit:
64bf9ca9a1146f7057c1d7771cd3a04de9bc9361
(Merge "msm: msm_bus: Provide valid input pointer argument").
Updated source and documentation to fix checkpatch warnings.

Change-Id: I6e84fc016a7bea69bb4d5d1991d8b5500244307d
Acked-by: Vivek Iyer <viyer@qti.qualcomm.com>
Acked-by: Mahesh Rohera <mrohera@qti.qualcomm.com>
Acked-by: Jay Jayanna <jjayanna@qti.qualcomm.com>
Signed-off-by: Sathish Ambley <sathishambley@codeaurora.org>