defconfig: Add support for compiling rpm-smd driver for sdxnightjar

Add config change to enable the rpm-smd driver for establishing
channel for APSS-RPM communication.

Change-Id: I858e97ed4f055eb874811e85f649d8a2e326c82e
Signed-off-by: Raghavendra Kakarla <rkakarla@codeaurora.org>
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>