drm/i915: Remove redundant clear of appgtt

Upon creation of the va range, it is initialised to point at scratch.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170215084357.19977-10-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -2769,10 +2769,6 @@ int i915_gem_init_aliasing_ppgtt(struct drm_i915_private *i915)
 			goto err_ppgtt;
 	}
 
-	ppgtt->base.clear_range(&ppgtt->base,
-				ppgtt->base.start,
-				ppgtt->base.total);
-
 	i915->mm.aliasing_ppgtt = ppgtt;
 
 	WARN_ON(ggtt->base.bind_vma != ggtt_bind_vma);