drm/amdgpu: enable DF clock gating for rn

Enable DF clock gating during DF IP early init.
Signed-off-by: NPrike Liang <Prike.Liang@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/soc15.c

@@ -1172,7 +1172,8 @@ static int soc15_common_early_init(void *handle)
 				 AMD_CG_SUPPORT_VCN_MGCG |
 				 AMD_CG_SUPPORT_IH_CG |
 				 AMD_CG_SUPPORT_ATHUB_LS |
-				 AMD_CG_SUPPORT_ATHUB_MGCG;
+				 AMD_CG_SUPPORT_ATHUB_MGCG |
+				 AMD_CG_SUPPORT_DF_MGCG;
 		adev->pg_flags = 0;
 		adev->external_rev_id = adev->rev_id + 0x91;