add support 4g -- >ppp

hc

2023-11-24 2b26ab132d1b33b91c84c6d732456200e8c5ee77

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/*
 * (C)Copyright 2016 Rockchip Electronics Co., Ltd
 * Authors: Andy Yan <andy.yan@rock-chips.com>
 * SPDX-License-Identifier:     GPL-2.0+
 */