msm: kgsl: Enable inter-frame power collapse on A615

Enable the inter-frame power collapse feature for the
Adreno 615 device. This feature saves power when the
GPU is idle.

Change-Id: I9f8e5cf73f9a8ef00f923c4550b8ec2e10f4f64e
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>