msm: kgsl: Correct CX vote for A618 GPU

During wake-up, GPU is supposed to vote for
low SVS CX corner but currently it's voting for
SVS corner which is incorrect. Fix this to avoid
power impact.

Change-Id: I9b3e4e59858f5e1b73a037aa2626122c06a2c9b7
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>