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

Add device bindings for the display susbsytem RSC. The RSC contains the
TCS that will be used to send sleep/wake/active requests to the RPMH
blocks for the SDE subystem.

Change-Id: If97008f9c8d1c0ea6b4d607f5d3bf9b7ea3811a8
Signed-off-by: Lina Iyer <ilina@codeaurora.org>