Remove protected leftovers

Author: manchoz

libraries/Ethernet/src/Ethernet.h

@@ -107,13 +107,6 @@ class EthernetClass : public MbedSocketClass {
 
  NetworkInterface *getNetwork();
 
-protected:
- SocketAddress _ip = nullptr;
- SocketAddress _gateway = nullptr;
- SocketAddress _netmask = nullptr;
- SocketAddress _dnsServer1 = nullptr;
- SocketAddress _dnsServer2 = nullptr;
-
 private:
  volatile EthernetLinkStatus _currentNetworkStatus = Unknown;
  EthernetInterface net;