Integrate meta-seconorth-machine/add_custom_alt_bootscript

Commit: seco-ne/yocto/layers/meta-seconorth-machine@ae0d8e91

bootscript:alt: Check for custom script and run it if found

The Flash-N-Go System bootscript should also check for an additional custom bootscript and run it if one was found.

Source merge request: seco-ne/yocto/layers/meta-seconorth-machine!443 (merged)

mentioned in merge request seco-ne/yocto/layers/meta-seconorth-machine!443 (merged)

merged