aerofc: allow to use 921600 baud to reboot

Tools/aero_upload.sh

@@ -62,7 +62,7 @@ ssh $target /bin/bash <<EOF
     echo -e "Updating firmware on AeroFC"
     ~/px_uploader.py \
         --port /dev/ttyS1 \
-        --baud-flightstack 1500000,460800,115200 \
+        --baud-flightstack 921600,460800,1500000,115200 \
         $(basename $firmware)
     echo "Firmware updated"
     if [ \$router_running -eq 1 ]; then