ata: sata_dwc_460ex: add __iomem to register base pointer

The pointer to the mmio register base is missing the __iomem
annotation.  Fix this.

Tested-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

drivers/ata/sata_dwc_460ex.c

@@ -145,7 +145,7 @@ struct sata_dwc_device {
 	struct ata_probe_ent	*pe;		/* ptr to probe-ent */
 	struct ata_host		*host;
 	u8 __iomem		*reg_base;
-	struct sata_dwc_regs	*sata_dwc_regs;	/* DW Synopsys SATA specific */
+	struct sata_dwc_regs __iomem *sata_dwc_regs;	/* DW SATA specific */
 	u32			sactive_issued;
 	u32			sactive_queued;
 	struct phy		*phy;