geofence: do not keep fence in memory

src/modules/navigator/geofence.h

@@ -46,11 +46,12 @@
 
 class Geofence {
 private:
-	struct fence_s	_fence;
 	orb_advert_t	_fence_pub;			/**< publish fence topic */
 
 	float			_altitude_min;
 	float			_altitude_max;
+
+	int 			_verticesCount;
 public:
 	Geofence();
 	~Geofence();
@@ -66,12 +67,6 @@ public:
 	bool inside(const struct vehicle_global_position_s *craft);
 	bool inside(double lat, double lon, float altitude);
 
-
-	/**
-	 * Load fence parameters.
-	 */
-	bool loadFromDm(unsigned vertices);
-
 	int clearDm();
 
 	bool valid();