add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256 734a1d5f21fb388bdbe64f7b599fef52357c3c72ff860f38456a352e7c1c3e78  dsp-tools-v2.0.tar.gz