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

Add AMD_CG_SUPPORT_SDMA_LS support.
SDMA MGCG programming is migrated to RLC.

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>