Clean up indirect SQ register accessors for gfx7/8

[Deucher, Alexander]

For the series:
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

> -----Original Message-----
> From: amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org] On Behalf
> Of Tom St Denis
> Sent: Monday, November 07, 2016 10:36 AM
> To: amd-gfx at lists.freedesktop.org
> Subject: Clean up indirect SQ register accessors for gfx7/8
> 
> Denumberify the two indirect accessors to make the code cleaner.
> 
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