[libata] convert drivers to use ata.h mode mask defines

No functional changes in this patch.

Signed-off-by: Erik Inge Bolsø <knan-lkml@anduin.net>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/pata_mpiix.c b/drivers/ata/pata_mpiix.c
index aa576ca..b21f002 100644
--- a/drivers/ata/pata_mpiix.c
+++ b/drivers/ata/pata_mpiix.c
@@ -200,7 +200,7 @@
 	   the MPIIX your box goes castors up */
 
 	ap->ops = &mpiix_port_ops;
-	ap->pio_mask = 0x1F;
+	ap->pio_mask = ATA_PIO4;
 	ap->flags |= ATA_FLAG_SLAVE_POSS;
 
 	ap->ioaddr.cmd_addr = cmd_addr;