[PATCH v2 3/3] arm: dts: imx8mn: protect the firmware/optee node with ifdef

[sbabic at denx.de]

> There is no need to include the firmware/optee node if the optee
> driver is not enabled.
> Signed-off-by: Tim Harvey <tharvey at gateworks.com>
> Reviewed-by: Fabio Estevam <festevam at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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