[PATCH] imx8mn_evk: Add the missing spl.bin entry

[sbabic at denx.de]

> From: Fabio Estevam <festevam at denx.de>
> The generated flash.bin does not boot the imx8mn evk LPDDR4 variant
> as it misses the spl.bin description in binman.
> Add its entry to fix the boot on the imx8mn evk LPDDR4 variant.
> Signed-off-by: Fabio Estevam <festevam at denx.de>
> Tested-by: Arti Zirk <art at zirk.me>
> Reviewed-by: Alper Nebi Yasak <alpernebiyasak at gmail.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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