[RESEND PATCH v2] arm: dts: imx8mn-u-boot: fix DDR3 only support

[sbabic at denx.de]

> In case the CONFIG_IMX8M_LPDDR4 and CONFIG_IMX8M_DDR4 options are both
> disabled (i. e. BSH boards), binmain fails because DDR4 bin files are
> missing.
> Fixes: 93c4c0e4dd1e75 ("arm: dts: imx8mn-u-boot: Create common imx8mn-u-boot.dtsi")
> Signed-off-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>
> Reviewed-by: Michael Trimarchi <michael at amarulasolutions.com>
> Reviewed-by: Fabio Estevam <festevam at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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