[U-Boot] ARM: atmel: add at91sam9g20ek_2mmc nand boot support

[andreas.devel at googlemail.com]

Dear Bo Shen,

> Add at91sam9g20_2mmc nand boot support. on this board, there is no
> dataflash, so disable it
> 
> change one commet for at91sam9g20ek board
> 
> Signed-off-by: Bo Shen <voice.shen at atmel.com>
> 
> ---
> board/atmel/at91sam9260ek/at91sam9260ek.c |    7 ++++++-
>  boards.cfg                                |    1 +
>  include/configs/at91sam9260ek.h           |    2 ++
>  3 files changed, 9 insertions(+), 1 deletion(-)

applied to u-boot-atmel/master, thanks!

Best regards

Andreas Bießmann