ARM: dts: msm: Remove GPU_CC_AHB_CLK from GPU on SDM845

GPU AHB clock is automatically controlled by CX head switch in HW.
Remove it from GPU driver controlled clock list.

Change-Id: I1c0c5ecafb0339a6b6d6d4071f7e3fc28f2db824
Signed-off-by: George Shen <sqiao@codeaurora.org>