iommu: Resolve ops in iommu_init_device()

Since iommu_init_device() was factored out, it is in fact the only
consumer of the ops which __iommu_probe_device() is resolving, so let it
do that itself rather than passing them in. This also puts the ops
lookup at a more logical point relative to the rest of the flow through
__iommu_probe_device().

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/fa4b6cfc67a352488b7f4e0b736008307ce9ac2e.1740753261.git.robin.murphy@arm.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>