Make intel_render_ring_init_dri and intel_init_ring_buffer symmetrical
with regards of workaround introduced by:
commit
27c1cbd06a7620b354cbb363834f3bb8df4f410d
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon Apr 9 13:59:46 2012 +0100
drm/i915/ringbuffer: Exclude last 2 cachlines of ring on 845g
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>