[libata] Use ATA_UDMAx standard masks when filling driver's udma_mask info

The ATA_UDMAx masks are self-documenting, and far better than manually
writing in the hex mask.

Note that pata_it8213 mask differed from the comment.  Added a FIXME there.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/sata_sil.c b/drivers/ata/sata_sil.c
index c3f0a86..2a86dc4 100644
--- a/drivers/ata/sata_sil.c
+++ b/drivers/ata/sata_sil.c
@@ -218,7 +218,7 @@
 		.flags		= SIL_DFL_PORT_FLAGS | SIL_FLAG_MOD15WRITE,
 		.pio_mask	= 0x1f,			/* pio0-4 */
 		.mwdma_mask	= 0x07,			/* mwdma0-2 */
-		.udma_mask	= 0x3f,			/* udma0-5 */
+		.udma_mask	= ATA_UDMA5,
 		.port_ops	= &sil_ops,
 	},
 	/* sil_3112_no_sata_irq */
@@ -227,7 +227,7 @@
 				  SIL_FLAG_NO_SATA_IRQ,
 		.pio_mask	= 0x1f,			/* pio0-4 */
 		.mwdma_mask	= 0x07,			/* mwdma0-2 */
-		.udma_mask	= 0x3f,			/* udma0-5 */
+		.udma_mask	= ATA_UDMA5,
 		.port_ops	= &sil_ops,
 	},
 	/* sil_3512 */
@@ -235,7 +235,7 @@
 		.flags		= SIL_DFL_PORT_FLAGS | SIL_FLAG_RERR_ON_DMA_ACT,
 		.pio_mask	= 0x1f,			/* pio0-4 */
 		.mwdma_mask	= 0x07,			/* mwdma0-2 */
-		.udma_mask	= 0x3f,			/* udma0-5 */
+		.udma_mask	= ATA_UDMA5,
 		.port_ops	= &sil_ops,
 	},
 	/* sil_3114 */
@@ -243,7 +243,7 @@
 		.flags		= SIL_DFL_PORT_FLAGS | SIL_FLAG_RERR_ON_DMA_ACT,
 		.pio_mask	= 0x1f,			/* pio0-4 */
 		.mwdma_mask	= 0x07,			/* mwdma0-2 */
-		.udma_mask	= 0x3f,			/* udma0-5 */
+		.udma_mask	= ATA_UDMA5,
 		.port_ops	= &sil_ops,
 	},
 };