msm: kgsl: Update hardware clock gating settings for A615 GPU

A615 GPU hardware clock gating settings are different compared
to A630, hence update them as per the recommendations.

Change-Id: I5bd79a29b90bdbfa0a9bacfaf71d3c81371fab4d
Signed-off-by: Rajesh Kemisetti <rajeshk@codeaurora.org>