[PATCH v2 07/11] configs: tdx: Do not overwrite fdtfile if it got set manually

[sbabic at denx.de]

> From: Philippe Schenker <philippe.schenker at toradex.com>
> In case a customer wants to set fdtfile currently preboot overrides it
> always with preboot just before the bootdelay. Use test -n to check
> if fdtfile is already set and only set it if nothing got touched manually
> Signed-off-by: Philippe Schenker <philippe.schenker at toradex.com>
> Signed-off-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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