Add NAND support for Compulab CM-FX6 CoM.

Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Tom Rini <trini@ti.com>
Acked-by: NIgor Grinberg <grinberg@compulab.co.il>
Signed-off-by: NNikita Kiryanov <nikita@compulab.co.il>