Ethernet: fix interface discovery on portenta c33

iface 1 and 2 are wifi interfaces, iface 3 is the ethernet one.

Author: pennam

libraries/SocketWrapper/Ethernet.h

@@ -46,7 +46,7 @@ class EthernetClass: public NetworkInterface
     EthernetHardwareStatus hardwareStatus() {
         const struct device *const dev = DEVICE_DT_GET(DT_COMPAT_GET_ANY_STATUS_OKAY(ethernet_phy));
         if (device_is_ready(dev)) {
-            for (int i = 1; i < 3; i++) {
+            for (int i = 1; i < 4; i++) {
                 auto _if = net_if_get_by_index(i);
                 if (!net_eth_type_is_wifi(_if)) {
                     netif = _if;