add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256 e127bddf850e7febd39cef2d2b13dca5fe19cc2a1bb1099d72b683be5d8bd1c0 i7z-5023138d7c35c4667c938b853e5ea89737334e92.tar.gz