iommu/omap: Move to_iommu definition from omap-iopgtable.h

The to_iommu definition is used only locally to the omap-iommu.c
source file, and it has nothing to do with the page attributes
defined in omap-iopgtable.h. So, move the definition out of
omap-iopgtable.h header file.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 7ce136d..78f32d1 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -34,6 +34,9 @@
 #include "omap-iopgtable.h"
 #include "omap-iommu.h"
 
+#define to_iommu(dev)							\
+	((struct omap_iommu *)platform_get_drvdata(to_platform_device(dev)))
+
 #define for_each_iotlb_cr(obj, n, __i, cr)				\
 	for (__i = 0;							\
 	     (__i < (n)) && (cr = __iotlb_read_cr((obj), __i), true);	\