defconfig: 8084: enable remote debugger driver

The remote debugger driver allows a debugger running on a host
PC to communicate with a remote stub running on peripheral
subsystems. Enable this driver on APQ8084.

Change-Id: I43fb0784df240ffcc558b12b1053a9cffc0b7668
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>