drm/i915: Remove commit_plane function pointer.

With sprites, cursors and primary planes taking the atomic state
this is now unused. It's removed in a separate commit to allow
a revert.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1452164052-21752-8-git-send-email-maarten.lankhorst@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drivers/gpu/drm/i915/intel_atomic_plane.c

@@ -198,9 +198,7 @@ static void intel_plane_atomic_update(struct drm_plane *plane,
 	struct drm_crtc_state *crtc_state =
 		drm_atomic_get_existing_crtc_state(old_state->state, crtc);
 
-	if (intel_plane->commit_plane)
-		intel_plane->commit_plane(plane, intel_state);
-	else if (intel_state->visible)
+	if (intel_state->visible)
 		intel_plane->update_plane(plane,
 					  to_intel_crtc_state(crtc_state),
 					  intel_state);

drivers/gpu/drm/i915/intel_drv.h

@@ -692,8 +692,6 @@ struct intel_plane {
 	int (*check_plane)(struct drm_plane *plane,
 			   struct intel_crtc_state *crtc_state,
 			   struct intel_plane_state *state);
-	void (*commit_plane)(struct drm_plane *plane,
-			     struct intel_plane_state *state);
 };
 
 struct intel_watermark_params {