ARM: dts: msm: Add APPS RSC device bindings for MSMSKUNK

Add device bindings for the apps processor's RSC. The RSC contains the
TCS that will be used to send sleep/wake/active requests to the RPMH
blocks for the APPS processor.

Change-Id: Id044bccda2410f629a9af6e51e5a505dd2168bde
Signed-off-by: Lina Iyer <ilina@codeaurora.org>