Add Ethernet library support

Author: pennam

src/Arduino_PortentaBreakoutCarrier.h

@@ -32,6 +32,8 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 #include <Wire.h>
 #include <SPI.h>
 #include <PDM.h>
+#include <Portenta_Ethernet.h>
+#include <Ethernet.h>
 #include "utility/Analog/Analog.h"
 
 #define LAST_ARDUINO_PIN_NUMBER LEDB + 1
@@ -249,6 +251,7 @@ class BreakoutCarrierClass {
     UART UART3;
     MbedSPI SPI_0;
     PDMClass PDM;
+    arduino::EthernetClass Ethernet;
     BreakoutCarrierClass() : I2C_0(PH_8,PH_7),
                              I2C_1(PB_7,PB_6),
                              I2C_2(PH_12,PH_11),
@@ -257,7 +260,8 @@ class BreakoutCarrierClass {
                              UART2(PG_14, PG_9, NC, NC),
                              UART3(PJ_8, PJ_9, NC, NC),
                              SPI_0(PC_2, PC_3, PI_1),
-                             PDM(PB_2, PE_2, NC)
+                             PDM(PB_2, PE_2, NC),
+                             Ethernet()
     {
     }
 };