Revert "msm: kgsl: Support GFX CPR control in GPU driver"

This reverts commit 500ef6e6.
SW workaround is not needed as CPR HW bug is fixed.

CRs-Fixed: 2085877
Change-Id: I356973be5f2e86ac4b2a484f675c9e408e6d653c
Signed-off-by: George Shen <sqiao@codeaurora.org>