drm/amdgpu: add GFX Clock Gating support for yellow carp

Add below supports:
GFX Coarse Grain Clock Gating(CGCG)
GFX Coarse grain light sleep/deep sleep(CGLS)
GFX Medium Grain Clock Gating(MGCG)
GFX Medium Grain light sleep/deep sleep(MGLS)
GFX Fine Grain Clock Gating(FGCG)
RLC MGLS
CP  MGLS

Signed-off-by: Aaron Liu <aaron.liu@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>