Use CCF to enable GPU clocks. Keep an extra reference to prevent runtime PM callbacks from disabling clocks while GPU is powered up. Bug 1673672 Change-Id: I8c34be5ec338fedea62aa3e05bd6bed0513bf1b6 Signed-off-by: Mahantesh Kumbar <mkumbar@nvidia.com> Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-on: http://git-master/r/788814 Reviewed-by: Automatic_Commit_Validation_User Reviewed-on: http://git-master/r/785265