drm/i915: kill ring->setup_status_page

It's the same code, essentially, so kill all copies safe one unified
version.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 43c5f7a..c509192 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -41,8 +41,6 @@
 			struct intel_ring_buffer *ring);
 	void		(*user_irq_put)(struct drm_device *dev,
 			struct intel_ring_buffer *ring);
-	void		(*setup_status_page)(struct drm_device *dev,
-			struct	intel_ring_buffer *ring);
 
 	int		(*init)(struct drm_device *dev,
 			struct intel_ring_buffer *ring);
@@ -128,5 +126,7 @@
 
 u32 intel_ring_get_active_head(struct drm_device *dev,
 			       struct intel_ring_buffer *ring);
+void intel_ring_setup_status_page(struct drm_device *dev,
+				  struct intel_ring_buffer *ring);
 
 #endif /* _INTEL_RINGBUFFER_H_ */