disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/include/linux/rpmsg/rockchip_rpmsg.h
..
..
@@ -1,4 +1,4 @@
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-/* SPDX-License-Identifier: GPL */
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+/* SPDX-License-Identifier: GPL-2.0 */
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 /*
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  * Copyright (c) 2022 Rockchip Electronics Co., Ltd.
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  */