udev-extraconf:mount.sh: fix a umount issue

Only touching /tmp/.automount-$name is not good enough, it must contain
the mount name, otherwise umount could not get the path from it.

(From OE-Core rev: ccea69032329f3ba43c727d9eb71b1d063b89824)

Signed-off-by: Ming Liu <liu.ming50@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/udev/udev-extraconf/mount.sh

@@ -89,7 +89,7 @@ automount_systemd() {
         rm_dir "$MOUNT_BASE/$name"
     else
         logger "mount.sh/automount" "Auto-mount of [$MOUNT_BASE/$name] successful"
-        touch "/tmp/.automount-$name"
+        echo "$name" > "/tmp/.automount-$name"
     fi
 }