Add SERIAL_PORT definitions for Teensy 2.x

teensy/pins_arduino.h

@@ -148,4 +148,9 @@ static inline uint8_t digitalPinToTimer(uint8_t pin)
 	}
 }
 
+#define SERIAL_PORT_MONITOR             Serial
+#define SERIAL_PORT_USBVIRTUAL          Serial
+#define SERIAL_PORT_HARDWARE            Serial1
+#define SERIAL_PORT_HARDWARE_OPEN       Serial1
+
 #endif