add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256    20ea2e8dd5d5e1ff1ff91dc7dab6db53a77d7b7183d8cf2425c215fd294f22a7    src-norm-1.5r6.tgz