drm/amdgpu/nv: enable gfx10.3.7 clock gating support

This will enable the following gfx clock gating.
- Fine clock gating
- Medium Grain clock gating
- 3D Coarse clock gating
- Coarse Grain clock gating
- RLC/CP light sleep clock gating

Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>