libata: Switch most of the remaining SFF drivers to ata_sff_port_start

This avoids allocating DMA buffers if not needed but at the moment is
mostly just a neatness item.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/pata_cmd640.c b/drivers/ata/pata_cmd640.c
index f09d4fa..43d198f 100644
--- a/drivers/ata/pata_cmd640.c
+++ b/drivers/ata/pata_cmd640.c
@@ -153,7 +153,7 @@
 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 	struct cmd640_reg *timing;
 
-	int ret = ata_port_start(ap);
+	int ret = ata_sff_port_start(ap);
 	if (ret < 0)
 		return ret;