uORB: Added vehicle_landed uORB topic

src/modules/uORB/topics/vehicle_land_detected.h

@@ -0,0 +1,23 @@
+#ifndef __TOPIC_VEHICLE_LANDED_H__
+#define __TOPIC_VEHICLE_LANDED_H__
+
+#include "../uORB.h"
+
+/**
+ * @addtogroup topics
+ * @{
+ */
+
+struct vehicle_land_detected_s {
+	uint64_t timestamp;	   /**< timestamp of the setpoint */
+	bool landed;           /**< true if vehicle is currently landed on the ground*/
+};
+
+/**
+ * @}
+ */
+
+/* register this as object request broker structure */
+ORB_DECLARE(vehicle_land_detected);
+
+#endif //__TOPIC_VEHICLE_LANDED_H__