drivers: video: ov2640: remove deprecated PM macro

Use NULL if no PM is available.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
diff --git a/drivers/video/ov2640.c b/drivers/video/ov2640.c
index 5d15109..795d16a 100644
--- a/drivers/video/ov2640.c
+++ b/drivers/video/ov2640.c
@@ -1060,7 +1060,7 @@
 	return ov2640_init(dev);
 }
 
-DEVICE_DT_INST_DEFINE(0, &ov2640_init_0, device_pm_control_nop,
+DEVICE_DT_INST_DEFINE(0, &ov2640_init_0, NULL,
 			&ov2640_data_0, NULL,
 			POST_KERNEL, CONFIG_VIDEO_INIT_PRIORITY,
 			&ov2640_driver_api);