Integrate meta-guf-machine/bootscript-fixes

Commit: https://gitlab.com/garz-fricke/yocto/layers/meta-guf-machine/-/commit/26569f64f8d9f3f74319381aa129f38117b37bfd

bootscripts: Change kernel name to linuximage, fix output

The output used '' but we want to see the loaded variables so "" is needed.