This patch moves all the IOMMU-based DMA-mapping code from arch/arm64/mmIOMMU works good on drm/rockchip ARM64 platform with this patch. So
to drivers/iommu/dma-iommu-ops.c. This way it can be easily shared with
ARM architecture, which will also use them.
Signed-off-by: Marek Szyprowski<m.szyprowski@xxxxxxxxxxx>