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

[Huang Rui]

On Tue, Sep 06, 2016 at 12:18:37PM -0400, Tom St Denis wrote:
> Various cleanups including simplifications, LOC reductions
> and whitespace corrections.
> 

For the whole patch set:

Reviewed-by: Huang Rui <ray.huang at amd.com>