iommu/arm-smmu-v3: Convert to domain_alloc_paging()

Now that the BLOCKED and IDENTITY behaviors are managed with their own
domains change to the domain_alloc_paging() op.

For now SVA remains using the old interface, eventually it will get its
own op that can pass in the device and mm_struct which will let us have a
sane lifetime for the mmu_notifier.

Call arm_smmu_domain_finalise() early if dev is available.

Tested-by: Shameer Kolothum <[email protected]>
Tested-by: Nicolin Chen <[email protected]>
Tested-by: Moritz Fischer <[email protected]>
Reviewed-by: Nicolin Chen <[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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