powerpc: Move dma-noncoherent.c from arch/powerpc/lib to arch/powerpc/mm
(pre-requisite to make the next patches more palatable)
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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(pre-requisite to make the next patches more palatable)
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>