add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/mailbox/mailbox.h
..
..
@@ -1,8 +1,4 @@
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-/*
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- */
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 #ifndef __MAILBOX_H
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 #define __MAILBOX_H