powerpc/dma: Remove dev->archdata.iommu_domain
There are no users left, so remove the pointer and save some memory. Signed-off-by: NJoerg Roedel <jroedel@suse.de> Reviewed-by: NJerry Snitselaar <jsnitsel@redhat.com> Link: https://lore.kernel.org/r/20200625130836.1916-14-joro@8bytes.org
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