add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256 9b87245ee091a798184e447066e9e0d7709b7c81f5e6ad55f2b958c1aa50c4a3 msr-tools-1.3.tar.gz