[Intel-gfx] [CI] drm/i915/tgl: Re-enable rc6

[Chris Wilson]

Quoting Chris Wilson (2019-09-13 21:06:38)
> From: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> 
> We think that we got rc6 problems sorted out. Flip the switch
> and let CI expose our tendency to naive optimism.
> 
> Signed-off-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris