[U-Boot] [PATCH] s3c2410_nand add missing functions for CONFIG_NAND_SPL

[Hui Tang]

Dear Scott,

> Why do you need to write to the buffer in the NAND SPL?  I don't think you
> need read_byte either.

Yes, we don't use nand_read_byte() and nand_write_buf(), it's just
copy from drivers/mtd/nand/s3c64xx.c.

BR.
Hui.