package/udev: create base device nodes after mounting a new /dev

Currently, udev won't start for me, as we've just mounted a new /dev,
which is completely empty, and udevd requires a /dev/null.

This change manually creates the three base device nodes (zero, null
and console) so that udev can start.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

package/udev/S10udev

@@ -58,6 +58,9 @@ case "$1" in
 	exit 1
 
         mkdir $udev_root/pts $udev_root/shm
+        mknod -m 0666 /dev/null c 1 3
+        mknod -m 0666 /dev/zero c 1 5
+        mknod -m 0600 /dev/console c 5 1
 
         # populate /dev (normally)
         echo -n "Populating $udev_root using udev: "