sdflight config: weird changes to get things working

- just use external mag, if they run together the sensor_mag_0 topic gets
corrupted even though they publish on different instances
- added sleep at two places, they resolve weird boot problems like params
not being read correctly...

Signed-off-by: Roman <bapstroman@gmail.com>

posix-configs/eagle/flight/px4.config

@@ -5,12 +5,14 @@ param set SYS_MC_EST_GROUP 2
 sleep 1
 gps start -d /dev/tty-4
 param set MAV_TYPE 2
+sleep 1
 df_hmc5883_wrapper start
-df_mpu9250_wrapper start
+df_mpu9250_wrapper start_without_mag
 df_bmp280_wrapper start
 df_trone_wrapper start
 #df_ltc2946_wrapper start # (currently not working on all boards...)
 #df_isl29501_wrapper start
+sleep 1
 sensors start
 commander start
 ekf2 start