add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed
sha256  092c26c51166d1d1f025cd06742981783dea7e42bfe4f73f10c4418fc003de94  ympd-v1.2.3.tar.gz