ARM: dts: msm: add remote debugger driver dt entry for 8226

The Remote Debugger Driver allows a debugger running on a host
PC to communicate with a remote stub running on peripheral
subsystems. Add device tree node for this driver on MSM8226.

Change-Id: I3009949f2435e33af0f0981483628af375461f6e
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: Aparna Das <adas@codeaurora.org>