powerpc/dma: use phys_to_dma instead of get_dma_offset
Use the standard portable helper instead of the powerpc specific one, which is about to go away. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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