All iommu capable platforms now always use the iommu code with the
internal bypass, so there is not need for this magic anymore.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Tested-by: NChristian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>