[PATCH] libata: add missing ->data_xfer for pdc_adma

pdc_adma use libata-core PIO path but were left out
during ->data_xfer conversion.  Initialize with proper callbacks.

This patch is against the current libata-dev#ALL.  Controllers which
implement their own PIO HSM (ahci and sil24) don't need ->data_xfer, so the
above two are the only drivers which were left out during conversion.

From: "Barry K. Nathan" <barryn@pobox.com>

Signed-off-by: Barry K. Nathan <barryn@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/scsi/pdc_adma.c

@@ -168,6 +168,7 @@ static const struct ata_port_operations adma_ata_ops = {
 	.qc_prep		= adma_qc_prep,
 	.qc_issue		= adma_qc_issue,
 	.eng_timeout		= adma_eng_timeout,
+	.data_xfer		= ata_mmio_data_xfer,
 	.irq_handler		= adma_intr,
 	.irq_clear		= adma_irq_clear,
 	.port_start		= adma_port_start,