Integrate meta-seconorth-distro/fix_install_devicetree
Commit: seco-ne/yocto/layers/meta-seconorth-distro@af4918cb
fngsystem:self-update: Added new devicetree handling
The handling of custom devicetrees and devicetree overlays has changed. Applied the changes made to the fng-install script to the fngsystem- self-update script as well.
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Commit: seco-ne/yocto/layers/meta-seconorth-distro@c0ac5c9b
fng-install: Fixed error that clears the dt in the config
If no custom devicetree is set, the devicetree file isn't present. In this case, the script would clear the default devicetree from the boot config. Added a check to the script, that prevents the clearing of the devicetree parameter.