Add MTD SPI Flash support for M25P16, M25P20, M25P32,
M25P40, M25P64, M25P80, M25P128.

Signed-off-by: Jason McMullan <mcmullan@netapp.com>
Signed-off-by: TsiChung Liew <Tsi-Chung.Liew@freescale.com>