T4240RDB: Enable CONFIG_SYS_CORTINA_FW_IN_NOR config

Now cortina driver uses macro CONFIG_SYS_CORTINA_FW_IN_NOR
to define that firmware of cortina driver is stored in the
nor flash.

Signed-off-by: Chunhe Lan <Chunhe.Lan@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>