iommu/rockchip: Use IOMMU device for dma mapping operations
Use the first registered IOMMU device for dma mapping operations, and drop the domain platform device. This is similar to exynos iommu driver. Signed-off-by: NJeffy Chen <jeffy.chen@rock-chips.com> Reviewed-by: NTomasz Figa <tfiga@chromium.org> Reviewed-by: NRobin Murphy <robin.murphy@arm.com> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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