[U-Boot] warp7: Fix dfu_alt_info setting after DM conversion

[sbabic at denx.de]

> After DM conversion, U-Boot is larger than 512 KiB, so we need to increase
> the "size" of the dfu_alt_info setting.
> Signed-off-by: Pierre-Jean Texier <pjtexier at koncepto.io>
> Acked-by: Joris Offouga <offougajoris at gmail.com>
> Reviewed-by: Fabio Estevam <festevam at gmail.com>

Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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