Start digital airspeed sensors as default

ROMFS/px4fmu_common/init.d/rc.sensors

@@ -27,6 +27,22 @@ else
 	set BOARD fmuv2
 fi
 
+# Start airspeed sensors
+if meas_airspeed start
+then
+	echo "using MEAS airspeed sensor"
+else
+	if ets_airspeed start
+	then
+		echo "using ETS airspeed sensor (bus 3)"
+	else
+		if ets_airspeed start -b 1
+		then
+			echo "Using ETS airspeed sensor (bus 1)"
+		fi
+	fi
+fi
+
 #
 # Start the sensor collection task.
 # IMPORTANT: this also loads param offsets