ArduCopter: include precision landing sensor in mavlink system status

Set MAV_SYS_STATUS_SENSOR_VISION_POSITION bit in onboard_control_sensors_present, onboard_control_sensors_enabled and onboard_control_sensors_health based on the status of precision landing sensor.

ArduCopter/GCS_Mavlink.cpp

@@ -143,6 +143,11 @@ NOINLINE void Copter::send_extended_status1(mavlink_channel_t chan)
     if (optflow.enabled()) {
         control_sensors_present |= MAV_SYS_STATUS_SENSOR_OPTICAL_FLOW;
     }
+#endif
+#if PRECISION_LANDING == ENABLED
+    if (precland.enabled()) {
+        control_sensors_present |= MAV_SYS_STATUS_SENSOR_VISION_POSITION;
+    }
 #endif
     if (ap.rc_receiver_present) {
         control_sensors_present |= MAV_SYS_STATUS_SENSOR_RC_RECEIVER;
@@ -194,6 +199,11 @@ NOINLINE void Copter::send_extended_status1(mavlink_channel_t chan)
     if (optflow.healthy()) {
         control_sensors_health |= MAV_SYS_STATUS_SENSOR_OPTICAL_FLOW;
     }
+#endif
+#if PRECISION_LANDING == ENABLED
+    if (precland.healthy()) {
+        control_sensors_health |= MAV_SYS_STATUS_SENSOR_VISION_POSITION;
+    }
 #endif
     if (ap.rc_receiver_present && !failsafe.radio) {
         control_sensors_health |= MAV_SYS_STATUS_SENSOR_RC_RECEIVER;