AP_NavEKF2: take EAS2TAS from AHRS rather than airspeed

libraries/AP_NavEKF2/AP_NavEKF2_Measurements.cpp

@@ -676,7 +676,7 @@ void NavEKF2_core::readAirSpdData()
     if (aspeed &&
             aspeed->use() &&
             aspeed->last_update_ms() != timeTasReceived_ms) {
-        tasDataNew.tas = aspeed->get_airspeed() * aspeed->get_EAS2TAS();
+        tasDataNew.tas = aspeed->get_airspeed() * AP::ahrs().get_EAS2TAS();
         timeTasReceived_ms = aspeed->last_update_ms();
         tasDataNew.time_ms = timeTasReceived_ms - frontend->tasDelay_ms;
 

libraries/AP_NavEKF2/AP_NavEKF2_VehicleStatus.cpp

@@ -313,7 +313,7 @@ void NavEKF2_core::detectFlight()
         // trigger at 8 m/s airspeed
         if (_ahrs->airspeed_sensor_enabled()) {
             const AP_Airspeed *airspeed = _ahrs->get_airspeed();
-            if (airspeed->get_airspeed() * airspeed->get_EAS2TAS() > 10.0f) {
+            if (airspeed->get_airspeed() * AP::ahrs().get_EAS2TAS() > 10.0f) {
                 highAirSpd = true;
             }
         }