In ov5640_mipi_v2.c, driver don't implement get_register/set_register callback but assign ov5640_get_register/ov5640_set_register to v4l2_subdev_core_ops->get_register/set_register if define CONFIG_VIDEO_ADV_DEBUG, so implement them in this patch. Signed-off-by: Guoniu.zhou <guoniu.zhou@nxp.com> Reviewed-by: Robby Cai <robby.cai@nxp.com>