add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/mtd/mtdcore.h
..
..
@@ -5,6 +5,7 @@
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  */
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 extern struct mutex mtd_table_mutex;
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+extern struct backing_dev_info *mtd_bdi;
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 struct mtd_info *__mtd_next_device(int i);
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 int __must_check add_mtd_device(struct mtd_info *mtd);