iommu: Put domain allocation in __iommu_group_alloc_blocking_domain()

There is no longer a reason to call __iommu_domain_alloc() to allocate
the blocking domain. All drivers that support a native blocking domain
provide it via the ops, for other drivers we should call
iommu_paging_domain_alloc().

__iommu_group_alloc_blocking_domain() is the only place that allocates
an BLOCKED domain, so move the ops->blocked_domain logic there.

Signed-off-by: Jason Gunthorpe <[email protected]>
Signed-off-by: Vasant Hegde <[email protected]>
Reviewed-by: Lu Baolu <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

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