Can set mount point for microSD

src/freedombone-prep

@@ -70,6 +70,11 @@ case $key in
     shift
     ROUTER_IP_ADDRESS="$1"
     ;;
+    # mount point
+    --mount)
+    shift
+    MICROSD_MOUNT_POINT="$1"
+    ;;
     *)
     # unknown option
     ;;