dma_declare_coherent_memory and SuperH

[Christoph Hellwig]

Hi SuperH maintainers,

I have a vague recollection that you were planning on dropping support
for non-devicetree platforms, is that still the case?

The reason I'm asking is because all but one users of
dma_declare_coherent_memory are in the sh platform setup code, and
I'd really like to move towards killing this function off.