drm/imx: Use atomic 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: Philipp Zabel <p.zabel@pengutronix.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20170712081344.25495-13-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/gpu/drm/imx/ipuv3-plane.c

@@ -675,7 +675,7 @@ int ipu_planes_assign_pre(struct drm_device *dev,
 	int available_pres = ipu_prg_max_active_channels();
 	int i;
 
-	for_each_plane_in_state(state, plane, plane_state, i) {
+	for_each_new_plane_in_state(state, plane, plane_state, i) {
 		struct ipu_plane_state *ipu_state =
 				to_ipu_plane_state(plane_state);
 		struct ipu_plane *ipu_plane = to_ipu_plane(plane);