[PATCH] arm: dts: imx8mn-u-boot: use versioned ddr4 firmware

[sbabic at denx.de]

> NXP tested imx8mn-ddr4 with firmware version 201810 only. Use this
> version for all imx8mn targets with DRAM DDR4.
> Fixes: 93c4c0e4dd1 ("arm: dts: imx8mn-u-boot: Create common imx8mn-u-boot.dtsi")
> Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov at foundries.io>
> Reviewed-by: Fabio Estevam <festevam at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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