drm/i915: Remove whitelist application from ringbuffer backend

There is no white-listing before Gen8 and after the removal ringbuffer
support for these platforms we can remove the call to this no-op.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20181129134128.7994-1-tvrtko.ursulin@linux.intel.com

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -667,8 +667,6 @@ static int init_render_ring(struct intel_engine_cs *engine)
 	if (ret)
 		return ret;
 
-	intel_whitelist_workarounds_apply(engine);
-
 	/* WaTimedSingleVertexDispatch:cl,bw,ctg,elk,ilk,snb */
 	if (IS_GEN(dev_priv, 4, 6))
 		I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(VS_TIMER_DISPATCH));