Fixed EthernetLibCompatible example error

Author: wiznet-mason

libraries/lwIP_Ethernet/src/EthernetCompat.h

@@ -97,5 +97,4 @@ class ArduinoEthernet : public LwipIntfDev<RawDev> {
 
 using ArduinoWiznet5500lwIP = ArduinoEthernet<Wiznet5500>;
 using ArduinoWiznet5100lwIP = ArduinoEthernet<Wiznet5100>;
-using ArduinoWiznet55rp20lwIP = ArduinoEthernet<Wiznet55rp20>;
 using ArduinoENC28J60lwIP   = ArduinoEthernet<ENC28J60>;