drm/amdgpu: enable VCN3.0 PG and CG for Sienna_Cichlid

By setting up the flags to the ASIC
Signed-off-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: James Zhu <James.Zhu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -710,8 +710,8 @@ static int nv_common_early_init(void *handle)
 		adev->external_rev_id = adev->rev_id + 0xa;
 		break;
 	case CHIP_SIENNA_CICHLID:
-		adev->cg_flags = 0;
-		adev->pg_flags = 0;
+		adev->cg_flags = AMD_CG_SUPPORT_VCN_MGCG;
+		adev->pg_flags = AMD_PG_SUPPORT_VCN;
 		adev->external_rev_id = adev->rev_id + 0x28;
 		break;
 	default: