mini2440: flash: nor flash detected

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
mtd: add original file

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
mini2440: add nor flash support

This commit can save env to nor flash:

SMDK2440 # sa
Saving Environment to Flash...
Un-Protected 1 sectors
Erasing Flash...
. done
Erased 1 sectors
Writing to Flash... 9....8....7....6....5....4....3....2....1....done
Protected 1 sectors

Signed-off-by: Fudong Bai <fudongbai@gmail.com>
mini2440: command auto completion support

Signed-off-by: Fudong Bai <fudongbai@gmail.com>