msm: defconfig: Enable ADSP remote debugger driver for msmcortex

Enable CONFIG_MSM_RDBG to allow remote debugging on msmcortex
with remote DSP processors.

Change-Id: I2c9a65af63c54c30dcdccb13de8af4aa7ec55494
Acked-by: Bharath Kumar <bkumar@qti.qualcomm.com>
Signed-off-by: Sathish Ambley <sathishambley@codeaurora.org>