libata: remove ATA_FLAG_MMIO

Commit 0d5ff566779f894ca9937231a181eb31e4adff0e (libata: convert to iomap)
removed all checks of ATA_FLAG_MMIO but neglected to remove the flag itself.
Do it now, at last...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/pdc_adma.c b/drivers/ata/pdc_adma.c
index adbe042..384f202 100644
--- a/drivers/ata/pdc_adma.c
+++ b/drivers/ata/pdc_adma.c
@@ -167,8 +167,7 @@
 	/* board_1841_idx */
 	{
 		.flags		= ATA_FLAG_SLAVE_POSS |
-				  ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO |
-				  ATA_FLAG_PIO_POLLING,
+				  ATA_FLAG_NO_LEGACY | ATA_FLAG_PIO_POLLING,
 		.pio_mask	= ATA_PIO4_ONLY,
 		.udma_mask	= ATA_UDMA4,
 		.port_ops	= &adma_ata_ops,