Integrate meta-seconorth-distro/fix_post_install

Commit: seco-ne/yocto/layers/meta-seconorth-distro@714adb35

fng-install: Fixed setting of custom devicetree

The post-install steps for setting a custom devicetree have been changed for the i.MX8 devices. For the custom devicetree to work again, the name of the devicetree needs to be written to the devicetree file in the boot partition.

BCS 746-000877