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_radisys.c b/drivers/ata/pata_radisys.c
index ece2190..d5b7649 100644
--- a/drivers/ata/pata_radisys.c
+++ b/drivers/ata/pata_radisys.c
@@ -231,7 +231,7 @@
 	.irq_clear		= ata_bmdma_irq_clear,
 	.irq_on			= ata_irq_on,
 
-	.port_start		= ata_port_start,
+	.port_start		= ata_sff_port_start,
 };