powerpc/dma: Use the struct dma_attrs in iommu code
Update iommu_alloc() to take the struct dma_attrs and pass them on to tce_build(). This change propagates down to the tce_build functions of all the platforms. Signed-off-by: NMark Nelson <markn@au1.ibm.com> Signed-off-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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