drm/atomic: fix plane iterator

The old framebuffer_changed function used old API. Changed to new one.

Fixes: 6597d05 ("Revert "drm/atomic: Remove drm_atomic_helper_framebuffer_changed."")
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>

Author: ehristev

drivers/gpu/drm/drm_atomic_helper.c

@@ -1481,7 +1481,7 @@ bool drm_atomic_helper_framebuffer_changed(struct drm_device *dev,
 	struct drm_plane_state *old_plane_state;
 	int i;
 
-	for_each_plane_in_state(old_state, plane, old_plane_state, i) {
+	for_each_old_plane_in_state(old_state, plane, old_plane_state, i) {
 		if (plane->state->crtc != crtc &&
 		    old_plane_state->crtc != crtc)
 			continue;