add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  30f37fc734572c1dbaa2504585bc23ba6b8fd7df767ae7155995b2ca0ebed960  genromfs-0.5.2.tar.gz