Integrate meta-seconorth-machine/fix_machine_names

Commit: seco-ne/yocto/layers/meta-seconorth-machine@f229d74c

bootscripts:kernel: Fixed machine names for i.MX8

We don't want to use the machine overrides from the meta-freescale layer. Therefore, we disabled the filter mechanism and re-added the old SoC names. To reflect this change, the files have been moved to the correct folders.