!449 at91sam9260平台增加mtdnand驱动用于支持uffs文件系统 (#5695)
* update bsp/at91sam9260/drivers/at91_nand.c.
* update bsp/at91sam9260/drivers/at91_nand.c.
* update bsp/at91sam9260/drivers/at91_nand.h.
* update bsp/at91sam9260/drivers/at91_nand.c.
* update bsp/at91sam9260/drivers/at91_nand.c.
* 添加at91sam9260下mtd nand flash驱动
Co-authored-by: Nbrightsally <121477585@qq.com>
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