drm/amdgpu: enable GFX CGCG/CGLS for GC11.0.0

Enable GFX CGCG (coarse grained clockgating) and
CGLS (coarse grained light sleep) for GC11.0.0.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>