drm/amdgpu: enable gfx cgcg&cgls for gfx v12_0_0

Enable GFX CGCG and CGLS for gfx version 12.0.0.

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