Integrate meta-seconorth-distro/kirkstone-prepare-image-fixes

Commit: seco-ne/yocto/layers/meta-seconorth-distro@3b84b29d

fng-install/prepare-image: Make output of prepare scripts visible

Also cleanup the output a little. Make sure that the prepare_rtc script only affects Tanaro devices

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@0a591e74

prepare-image: Remove overlays folder in /boot

The overlays no live directly in /boot without a subfolder

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@6e0b178f

prepare-image: Rename path of include to seconorth (from guf)

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@6d080707

busybox: dd: Enable more options

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@280a1000

prepare-bootpartition: Make fatlabel optional, delete fs entry if fatlabel exists

For GPL-3.0 free images dosfstools are not available.