mx28evk: Guard NAND-related ENV defines with CONFIG_ENV_IS_IN_NAND

The redundancy related defines are only correct for NAND, so guard all
of that area with CONFIG_ENV_IS_IN_NAND

Cc: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Tom Rini <trini@ti.com>
1 file changed