iommu: Fix iommu_probe_device() to attach the right domain

The general invariant is that all devices in an iommu_group are attached
to group->domain. We missed some cases here where an owned group would not
get the device attached.

Rework this logic so it follows the default domain flow of the
bus_iommu_probe() - call iommu_alloc_default_domain(), then use
__iommu_group_set_domain_internal() to set up all the devices.

Finally always attach the device to the current domain if it is already
set.

This is an unlikely functional issue as iommufd uses iommu_attach_group().
It is possible to hot plug in a new group member, add a vfio driver to it
and then hot add it to an existing iommufd. In this case it is required
that the core code set the iommu_domain properly since iommufd won't call
iommu_attach_group() again.

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

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