libata: force PIO on IOMEGA ZIP 250 ATAPI

IOMEGA ZIP 250 ATAPI claims MWDMA0 support but fails SETXFERMODE if
asked to configure itself to MWDMA0.  Force PIO.

This fixes bugzilla bug#8497.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Calvin Walton <calvin.walton@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/libata-core.c

@@ -3771,6 +3771,7 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
 	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
 	{ "SAMSUNG CD-ROM SN-124","N001",	ATA_HORKAGE_NODMA },
 	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
+	{ "IOMEGA  ZIP 250       ATAPI", NULL,	ATA_HORKAGE_NODMA }, /* temporary fix */
 
 	/* Weird ATAPI devices */
 	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 |