iommu/arm-smmu-v3: Implement IOMMU_HWPT_ALLOC_NEST_PARENT

For SMMUv3 the parent must be a S2 domain, which can be composed
into a IOMMU_DOMAIN_NESTED.

In future the S2 parent will also need a VMID linked to the VIOMMU and
even to KVM.

Reviewed-by: Nicolin Chen <[email protected]>
Tested-by: Nicolin Chen <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Reviewed-by: Jerry Snitselaar <[email protected]>
Reviewed-by: Mostafa Saleh <[email protected]>
Reviewed-by: Donald Dutile <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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