drm/amdgpu: Add clock gating support for aldebaran

Aldebaran clock gating support for GFX,SDMA,IH blocks
VCN/JPEG blocks are excluded in this patch, to be enabled later

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Acked-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>