Tidy up the CZ SMU Mananger

[Edward O'Callaghan]

With the SDMA0 duplicate fixup, this series is:

Reviewed-by: Edward O'Callaghan <funfunctor at folklore1984.net>

On 08/27/2016 02:46 AM, Tom St Denis wrote:
> The first two patches fix up code style and error return codes.
> 
> The third patch avoids loading the MEC1 firmware twice on Stoney
> parts.
> 
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