ARM: dts: Add MSM QMP nodes for sdxprairie

QMP is a lighweight messaging protocol to remote procs within the SoC.
Add device nodes to enable communication to AOP.

Change-Id: Ibb8c77d498ede9255d942b6da7db5e51ed94f09b
Acked-by: Gaurang Parikh <gparikh@qti.qualcomm.com>
Signed-off-by: Chris Lew <clew@codeaurora.org>