Integrate meta-seco-imx/kirkstone_develop_c72mini_ym

Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-imx/-/commit/79e4173cdcc64dbbbbc4bf3fcec4ad53154e19aa

[MACHINE][C72 Mini] Add configuration for C72 Mini

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Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-imx/-/commit/457afd5d63f895216d9b72f1fec2a1cab4b864ed

[MACHINE][C72 Mini] Add devicetree for C72 Mini

• Rename overlays: in common for Mini and Nano
• Add devicetree for Mini using machineoverride
• Use ":append" instead of "+=" for KERNEL_DEVICETRE; in this way the correct devicetree is assigned after the machineoverride setting in the SoC specific configuration.

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Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-imx/-/commit/5f7de69e6975a7b4bad172d7b9c4d330251e4aa9

[YCONFIG] Add C72 Mini configuration