UDP for RAK4631 Eth Gw and the t-eth-elite. Solves #7149 (#7385)

* UDP for RAK4631 Eth Gw and the t-eth-elite. Also enable IP output on Portduino. Solves #7149

* Copilot suggestion

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* fix portduino build

* initialize local port

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/mesh/eth/ethClient.cpp

@@ -68,6 +68,9 @@ static int32_t reconnectETH()
                 initApiServer();
             }
 #endif
+            if (udpHandler && config.network.enabled_protocols & meshtastic_Config_NetworkConfig_ProtocolFlags_UDP_BROADCAST) {
+                udpHandler->start();
+            }
 
             ethStartupComplete = true;
         }