uboot-imx

S3C2410 NAND Flash Add Missing Function

This patch add nand_read_buf() for S3C2410 NAND SPL.
In nand_spl/nand_boot.c, nand_boot() will check nand->select_chip,
so nand->select_chip should also be initialized.

Signed-off-by: Hui.Tang <zetalabs@gmail.com>