Integrate meta-seconorth-mtk/load-dtbo-from-fitimage

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Commit: seco-ne/yocto/layers/meta-seconorth-mtk@754eab20

machine:genio: Remove dtb and dtbo files from IMAGE_BOOT_FILES

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Commit: seco-ne/yocto/layers/meta-seconorth-mtk@b4f119e2

u-boot:script: Load fdt file and overlays directly from fitImage

This way it's the same procedure as for normal Yocto image