Currently systemd cannot boot correctly on NFS. This is because
the code uses readdir which returns DT_UNKNOWN instead of DT_LNK
on NFS. So consider DT_UNKNOWN to fix this problem.
(From OE-Core rev: 9973f89dafdf9d21f4021f59f1f4669f4ac13aff)
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>