This allows "umount -f -a -r" in our initscripts to actually do something.
(From OE-Core rev: 578c938968857976f888f708f1f57cf862c7b3c4)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>