Integrate meta-seconorth-machine/add-yocto-install-recipe

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Commit: seco-ne/yocto/layers/meta-seconorth-machine@fe129eee

fng-install: mv to machine, rename recipe to yocto-install

Add recipe to build the install scripts and the post installation steps
from the new repository.
Set MACHINE_INSTALL_SCRIPTS variable to include the install scripts
independently from the distro.