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/config/hpl_usb_config.h b/sysmoOCTSIM/config/hpl_usb_config.h
index 02439a3..73a9fea 100644
--- a/sysmoOCTSIM/config/hpl_usb_config.h
+++ b/sysmoOCTSIM/config/hpl_usb_config.h
@@ -39,7 +39,7 @@
 // <CONF_USB_D_N_EP_MAX"> Max possible (by "Max Endpoint Number" config)
 // <id> usbd_num_ep_sp
 #ifndef CONF_USB_D_NUM_EP_SP
-#define CONF_USB_D_NUM_EP_SP CONF_USB_D_N_EP_MAX
+#define CONF_USB_D_NUM_EP_SP CONF_USB_N_4
 #endif
 
 // </h>