[PATCH v2 5/5] of: address: Always use dma_default_coherent for default coherency

[Christoph Hellwig]

> -	select OF_DMA_DEFAULT_COHERENT		if !NOT_COHERENT_CACHE

Doesn't powerpc need to select CONFIG_ARCH_DMA_DEFAULT_COHERENT now,
or even better should be doing that in the patch adding that
symbol?

In fact I wonder if adding CONFIG_ARCH_DMA_DEFAULT_COHERENT and removing
OF_DMA_DEFAULT_COHERENT should be one patch, as that seems to bring
over the intent a little better I'd say.