[Intel-gfx] [PATCH 4/5] drm/i915: Remove kbl preproduction workarounds

[Chris Wilson]

Quoting Mika Kuoppala (2018-06-08 14:42:04)
> We don't need kbl preprod workarounds anymore.
> 
> Signed-off-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>

As we now consider cnl stable, and icl the new development branch, we
can rid ourselves of preproduction w/a for anything older than cnl. (By
my understanding of our process rules.)

Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris