Add a driver for Macronix raw NAND controller.
This patch referred from linux mxic_nand.c. The difference from the
linux version is described here.
1. In order to adapt to the uboot nand framework, add function
binding (cmdfunc, read_byte, read_buf, write_buf).
2. Added parsing command format to use hardware correctly.
3. Remove the incompatible functions of Uboot.
Signed-off-by: Zhengxun Li <zhengxunli@mxic.com.tw>
