IOMMU Updates for Linux v4.5 The updates include: * Small code cleanups in the AMD IOMMUv2 driver * Scalability improvements for the DMA-API implementation of the AMD IOMMU driver. This is just a starting point, but already showed some good improvements in my tests. * Removal of the unused Renesas IPMMU/IPMMUI driver * Updates for ARM-SMMU include: * Some fixes to get the driver working nicely on Broadcom hardware * A change to the io-pgtable API to indicate the unit in which to flush (all callers converted, with Ack from Laurent) * Use of devm_* for allocating/freeing the SMMUv3 buffers * Some other small fixes and improvements for other drivers