iommu: Fix deferred domain attachment

The IOMMU core code has support for deferring the attachment of a domain
to a device. This is needed in kdump kernels where the new domain must
not be attached to a device before the device driver takes it over.

When the AMD IOMMU driver got converted to use the dma-iommu
implementation, the deferred attaching got lost. The code in
dma-iommu.c has support for deferred attaching, but it calls into
iommu_attach_device() to actually do it. But iommu_attach_device()
will check if the device should be deferred in it code-path and do
nothing, breaking deferred attachment.

Move the is_deferred_attach() check out of the attach_device path and
into iommu_group_add_device() to make deferred attaching work from the
dma-iommu code.

Fixes: 795bbbb9b6f8 ("iommu/dma-iommu: Handle deferred devices")
Reported-by: Jerry Snitselaar <[email protected]>
Suggested-by: Robin Murphy <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>
Tested-by: Jerry Snitselaar <[email protected]>
Cc: Jerry Snitselaar <[email protected]>
Cc: Tom Murphy <[email protected]>
Cc: Robin Murphy <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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