net: ethernet: mtk_eth_soc: handle VLAN pop action

Do not hit EOPNOTSUPP when flowtable offload provides a VLAN pop action.

Fixes: efce49df ("netfilter: flowtable: add vlan pop action offload support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mediatek/mtk_ppe_offload.c

@@ -232,6 +232,8 @@ mtk_flow_offload_replace(struct mtk_eth *eth, struct flow_cls_offload *f)
 			data.vlan.proto = act->vlan.proto;
 			data.vlan.num++;
 			break;
+		case FLOW_ACTION_VLAN_POP:
+			break;
 		case FLOW_ACTION_PPPOE_PUSH:
 			if (data.pppoe.num == 1)
 				return -EOPNOTSUPP;