[libata sata_nv] sync with 2.4

Driver should be using LIBATA_MAX_PRD not ATA_MAX_PRD,
due to iommu layer splitting.

drivers/scsi/sata_nv.c

@@ -187,7 +187,7 @@ static Scsi_Host_Template nv_sht = {
 	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
-	.sg_tablesize		= ATA_MAX_PRD,
+	.sg_tablesize		= LIBATA_MAX_PRD,
 	.max_sectors		= ATA_MAX_SECTORS,
 	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
 	.emulated		= ATA_SHT_EMULATED,