add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/tty/n_tty.c
..
..
@@ -49,6 +49,7 @@
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 #include <linux/module.h>
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 #include <linux/ratelimit.h>
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 #include <linux/vmalloc.h>
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+#include "tty.h"
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 /*
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  * Until this number of characters is queued in the xmit buffer, select will