iommu/io-pgtable: Add ARMv7 short descriptor support
Add a nearly-complete ARMv7 short descriptor implementation, omitting only a few legacy and CPU-centric aspects which shouldn't be necessary for IOMMU API use anyway. Reviewed-by: NYong Wu <yong.wu@mediatek.com> Tested-by: NYong Wu <yong.wu@mediatek.com> Signed-off-by: NYong Wu <yong.wu@mediatek.com> Signed-off-by: NRobin Murphy <robin.murphy@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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