libata: quirk IOMEGA ZIP 250 ATAPI FLOPPY

The Zip 250 which chokes on MWDMA SET_XFERMODE sometimes have "Floppy"
appeneded to its model number.  Quirk it too.

  http://bugzilla.kernel.org/show_bug.cgi?id=8563



Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Hans de Bruin <bruinjm@xs4all.nl>
Signed-off-by: Jeff Garzik <jeff@garzik.org>