Various tidy'ups with SI DMA/DPM/SMC/IH code

[Edward O'Callaghan]

Patches 1-6 are,
Reviewed-by: Edward O'Callaghan <funfunctor at folklore1984.net>
Patch 7 is,
Acked-by: Edward O'Callaghan <funfunctor at folklore1984.net>

On 09/07/2016 02:18 AM, Tom St Denis wrote:
> Various cleanups including simplifications, LOC reductions
> and whitespace corrections.
> 
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> 

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