dma-debug cleanups, including removing the arch hook

[Christoph Hellwig]

Any comments?  I'd like to move forward with this rather sooner
than later, so any reviews welcome!

On Tue, Apr 24, 2018 at 04:02:32PM +0200, Christoph Hellwig wrote:
> Hi all,
> 
> this series has a few dma-debug cleanups, most notably removing the need
> for architectures to explicitly initialize dma-debug.
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