msm: kgsl: Remove GPU_CC_GX_CXO_CLK from list of clocks

Remove this clock as this will be removed from the A6XX dtsi
file as well. This is needed because this clock is being removed
from the clock driver and will no long be controlled by
any client driver. The default state of this clock ensures that
it will turn ON/OFF when the GX GDSC is turned ON/OFF.

Change-Id: I158a52f313218186b4f0ca9a2854f8f7fc4972fa
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>