ARM: dts: msm: Add SPS node for sdxprairie

Add SPS module to device tree. SPS (Smart Peripheral System)
enables the support of all BAMs in the system which provide DMA
functionality to various peripherals.

Change-Id: I2c2569d0ebb7e40b22902598b89adff46b0f4eb9
Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>