Lock /usr/bin/eject and its dependencies into memory.

It's now used at shutdown time by udev-watchdog-wrapper,
when the boot device is removed,
so it'd better be in memory already.

config/chroot_local-includes/etc/memlockd.cfg

@@ -8,3 +8,4 @@
 /etc/default/locale
 /vmlinuz
 /initrd.img
++/usr/bin/eject