add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed
sha256 d92b438cea348ae316c4b2cbf367b4f01ed821a947e6a34d813624e9e3c936c1  tinyalsa-1.1.1.tar.gz