drm/mediatek: Convert to new iterator macros

for_each_obj_in_state is about to be removed, so use the new atomic
iterator macros.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: CK Hu <ck.hu@mediatek.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mediatek@lists.infradead.org
Link: http://patchwork.freedesktop.org/patch/msgid/20170712081344.25495-14-maarten.lankhorst@linux.intel.comReviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/gpu/drm/mediatek/mtk_drm_drv.c

@@ -48,11 +48,11 @@ static void mtk_atomic_schedule(struct mtk_drm_private *private,
 static void mtk_atomic_wait_for_fences(struct drm_atomic_state *state)
 {
 	struct drm_plane *plane;
-	struct drm_plane_state *plane_state;
+	struct drm_plane_state *new_plane_state;
 	int i;
 
-	for_each_plane_in_state(state, plane, plane_state, i)
-		mtk_fb_wait(plane->state->fb);
+	for_each_new_plane_in_state(state, plane, new_plane_state, i)
+		mtk_fb_wait(new_plane_state->fb);
 }
 
 static void mtk_atomic_complete(struct mtk_drm_private *private,