uboot-imx

TI DaVinci: DM6446: Fix Compilation error in NAND mode

The Default mode that is built for the Davinci DVEVM happens
to be the NOR mode.
When we want to build for the NAND mode, we get a compilation
error. This is overcome by defining the CONFIG_MTD_DEVICE
flag in the NAND mode.
The image built for NAND mode was successfully tested on the
DaVinci DM6446 EVM.

Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>