add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256 92bc64180135eea8fe84c91c9f894e678767764f6dbc8482021d4dde09857505 atf-0.21.tar.gz