add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256 eb696009ff8c33004211e484649b34edb14f3efb2ff618942bc8888716757a55  micropython-lib-v1.8.6.tar.gz