vfio: remove the iommudata hack for noiommu groups

Just pass a noiommu argument to vfio_create_group and set up the
->noiommu flag directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20210924155705.4258-7-hch@lst.de


Signed-off-by: Alex Williamson <alex.williamson@redhat.com>