add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  78549714e7c7fa246a4019c245f4da044aee6cfe48ad6887c4013ac4c749c7b9  bootutils-1.0.0.tar.gz