iommu: Move default domain allocation to iommu_group_get_for_dev()

Now that the iommu core support for iommu groups is not
pci-centric anymore, we can move default domain allocation
to the bus independent iommu_group_get_for_dev() function.

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