switch from dev board to prototype

the SAM E54 Xplained Pro development board uses a SAM E54P20N
micro-controller.
the sysmocom sysmoOCTSIM prototype uses a SAM E54N19A
micro-controller.
the system LED and UART debug GPIO are different, else the code
is the same.
the Atmel START definitions have been updated accordingly.

Change-Id: Ifd15f6759c51b42a8d11b09f9f495d7e7a5b6afc
diff --git a/sysmoOCTSIM/atmel_start_pins.h b/sysmoOCTSIM/atmel_start_pins.h
index 7c774ed..884a562 100644
--- a/sysmoOCTSIM/atmel_start_pins.h
+++ b/sysmoOCTSIM/atmel_start_pins.h
@@ -27,10 +27,10 @@
 #define GPIO_PIN_FUNCTION_M 12
 #define GPIO_PIN_FUNCTION_N 13
 
-#define PA24 GPIO(GPIO_PORTA, 24)
-#define PA25 GPIO(GPIO_PORTA, 25)
-#define PB24 GPIO(GPIO_PORTB, 24)
-#define PB25 GPIO(GPIO_PORTB, 25)
-#define LED_system GPIO(GPIO_PORTC, 18)
+#define USBUP_D_N GPIO(GPIO_PORTA, 24)
+#define USBUP_D_P GPIO(GPIO_PORTA, 25)
+#define UART_TX GPIO(GPIO_PORTB, 30)
+#define UART_RX GPIO(GPIO_PORTB, 31)
+#define LED_system GPIO(GPIO_PORTC, 26)
 
 #endif // ATMEL_START_PINS_H_INCLUDED