move preference converter switch cases to NetworkUtil

src/util/NetworkUtil.h

@@ -1,9 +1,14 @@
 #pragma once
 
+#include <string>
+#include <ETH.h>
 #include "../enums/NetworkDeviceType.h"
 
 class NetworkUtil
 {
 public:
     static NetworkDeviceType GetDeviceTypeFromPreference(int hardwareDetect, int customPhy);
+    static std::string GetCustomEthernetDeviceName(int custPHY);
+    static eth_phy_type_t GetCustomEthernetType(int custPHY);
+    static eth_clock_mode_t GetCustomClock(int custCLKpref);
 };