powerpc/dma: remove the unused dma_iommu_ops export

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/dma-iommu.c

@@ -6,7 +6,6 @@
  * busses using the iommu infrastructure
  */
 
-#include <linux/export.h>
 #include <asm/iommu.h>
 
 /*
@@ -123,4 +122,3 @@ struct dma_map_ops dma_iommu_ops = {
 	.get_required_mask	= dma_iommu_get_required_mask,
 	.mapping_error		= dma_iommu_mapping_error,
 };
-EXPORT_SYMBOL(dma_iommu_ops);