[POWERPC] mpc82xx: Define CPU_FTR_NEED_COHERENT
The 8272 (and presumably other PCI PQ2 chips) appear to have the same issue as the 83xx regarding PCI streaming DMA. Signed-off-by: NScott Wood <scottwood@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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