AP_Notify: don't define devices for minlure

It still doesn't have a notify device.

libraries/AP_Notify/AP_Notify.cpp

@@ -58,6 +58,8 @@ struct AP_Notify::notify_events_type AP_Notify::events;
         ToshibaLED_I2C toshibaled;
         ToneAlarm_Linux tonealarm;
         NotifyDevice *AP_Notify::_devices[] = {&toshibaled, &tonealarm};
+    #elif CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_MINLURE
+        NotifyDevice *AP_Notify::_devices[0];
     #else
         AP_BoardLED boardled;
         ToshibaLED_I2C toshibaled;