colibri_imx6ull/imx7: add missing tdxargs variable

All the other boards have tdxargs specified for setting manual kernel
command-line arguments. Add them also to NAND-based boards.

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
2 files changed