AP_Vehicle: move some common init_ardupilot code up to AP_Vehicle

libraries/AP_Vehicle/AP_Vehicle.cpp

@@ -1,5 +1,7 @@
 #include "AP_Vehicle.h"
 
+#include <AP_Common/AP_FWVersion.h>
+
 #define SCHED_TASK(func, rate_hz, max_time_micros) SCHED_TASK_CLASS(AP_Vehicle, &vehicle, func, rate_hz, max_time_micros)
 
 /*

libraries/AP_Vehicle/AP_Vehicle.h

@@ -163,6 +163,7 @@ public:
 protected:
 
     virtual void init_ardupilot() = 0;
+    virtual void load_parameters() = 0;
 
     // board specific config
     AP_BoardConfig BoardConfig;