uboot-imx

udoo: Remove SPL fat support

Use dd'ed SPL and u-boot.img by default.

Signed-off-by: Peter Vicman <peter.vicman@gmail.com>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Reviewed-by: Stefano Babic <sbabic@denx.de>
Acked-by: Fabio Estevam <fabio.estevam@freescale.com>