[Intel-gfx] Fixes that failed to apply to v5.11-rc4

[Chris Wilson]

Quoting Jani Nikula (2021-01-18 09:07:02)
> 
> The following commits have been marked as Cc: stable or fixing something
> in v5.11-rc4 or earlier, but failed to cherry-pick to
> drm-intel-fixes. Please see if they are worth backporting, and please do
> so if they are.
> 
> Conflicts:
> 6a3daee1b38e ("drm/i915/selftests: Fix some error codes")

Selftest bad error codes, that should not impact users so not worth the
backport.
-Chris