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>