Integrate meta-seconorth-machine/defconfig

Commit: seco-ne/yocto-mediatek/layers/meta-seconorth-machine@45bc2bca

recipes: Remove u-boot patches

They were applied directly to source code to be able to build the image after using 'devtool modify u-boot-seco-mtk' and commit changes directly to source code and not create patch files. Otherwise, you need to keep the 'devtool' branch with applied patches and separately commit to a feature-branch