allow the partition handler to identify a valid FS before interposition to /packages/misc-files.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@siriusit.co.uk>
git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@792 f158a5a8-5612-0410-a976-696ce0be7e32