ARM: dts: msm: Update properties for the GPU GDSCs on SDM855

Add the clock-disable-wait value for the gpu_cx GDSC based on
the HW recommendation. Also add the support to force-enable the
graphics GX RCG prior to enabling or disabling the GX GDSC.

Change-Id: I435983ed800cbf90feb44d9e8114eed1a5fce934
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>