ARM: dts: msm: Add dependency on XO clock for GPUCC driver on MSM8953

Add support of XO clock so that GPUCC driver's probe will defer
until registration of GCC clocks.

Change-Id: I1364880afd10b090e546ce83c7ceaa2d48d6909e
Signed-off-by: Amit Nischal <anischal@codeaurora.org>