device_def_domain_type documentation header does not match implementation

[Diederik de Haas]

Hi,

While looking into ``drivers/iommu/intel/iommu.c::device_def_domain_type`` 
function I noticed a discrepancy between the documentation header and the 
implementation.

``@startup: true if this is during early boot``
0e31a7266508 ("iommu/vt-d: Remove startup parameter from 
device_def_domain_type()")
removed the ``startup`` function parameter

returns ``IOMMU_DOMAIN_DMA: device requires a dynamic mapping domain``
28b41e2c6aeb ("iommu: Move def_domain type check for untrusted device into 
core") 
moved the possible return of ``IOMMU_DOMAIN_DMA`` to ``drivers/iommu/iommu.c``

But neither updated the documentation header.

Cheers,
  Diederik

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