[Intel-gfx] [PATCH] drm/i915: Remove lite restore defines

[Chris Wilson]

Quoting Mika Kuoppala (2020-02-03 16:33:12)
> We have switched from tail manipulation to forced context restore
> to implement WaIdleLiteRestore. Remove the useless defines and comments.

We still use the wa_tail as the first pass to avoid having to do
WaIdleLiteRestore. And we do need to reset the ring after a
suspend/resume because of the wa_tail. Hopefully, our selftest for the
latter still detects such bugs...

We just aren't using the macro any more.
-Chris