ARM: dts: msm: add sps node for sdm855

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

Change-Id: I52ecd5c4d18af568d07e74b071579f607c5b6c53
Signed-off-by: Yan He <yanhe@codeaurora.org>