add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256  e9a99cc81ef0a93f3484e5093efd14d93cc967221fcd22c151f0bea32eb91da7  sispmctl-3.1.tar.gz