iommu: add iommu_device_max_index IOMMU helper function
This function helps IOMMUs to know the highest address that a device can access to. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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6e03f998
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