PX4 ROMFS: Start even if uSD is not installed

mk/PX4/ROMFS/init.d/rcS

@@ -75,24 +75,14 @@ else
     fi
 fi
 
-if [ $HAVE_MICROSD == 0 ]
-then
-    if usb_connected
-    then
-        echo "Opening USB nsh"
-    else
-        echo "booting with no microSD"
-        set HAVE_MICROSD 1
-    fi
-fi
-
 # if this is an APM build then there will be a rc.APM script
 # from an EXTERNAL_SCRIPTS build option
-if [ -f /etc/init.d/rc.APM -a $HAVE_MICROSD == 1 -a ! -f /fs/microsd/APM/nostart ]
+if [ -f /etc/init.d/rc.APM -a ! -f /fs/microsd/APM/nostart ]
 then
     echo Running rc.APM
     # if APM startup is successful then nsh will exit
     sh /etc/init.d/rc.APM
 else
+    echo "Opening USB nsh"
     nshterm /dev/ttyACM0 &
 fi