drm/amdgpu: enable GFX clock gating for beige_goby

Enable GFX MGCG, CGCG and 3DCG for beige_goby.
Signed-off-by: NTao Zhou <tao.zhou1@amd.com>
Reviewed-by: NJiansong Chen <Jiansong.Chen@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -1278,7 +1278,9 @@ static int nv_common_early_init(void *handle)
 		adev->external_rev_id = adev->rev_id + 0x3c;
 		break;
 	case CHIP_BEIGE_GOBY:
-		adev->cg_flags = 0;
+		adev->cg_flags = AMD_CG_SUPPORT_GFX_MGCG |
+			AMD_CG_SUPPORT_GFX_CGCG |
+			AMD_CG_SUPPORT_GFX_3D_CGCG;
 		adev->pg_flags = AMD_PG_SUPPORT_VCN |
 			AMD_PG_SUPPORT_VCN_DPG;
 		adev->external_rev_id = adev->rev_id + 0x46;