add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256 0451e1a843bf02df81126a1625d9a15dfdf19dcb2f9e95b0613a63e59fd31ca8 rpi-firmware-2067241bc7cdf238fdeab7f5a3c22faa57dd5617.tar.gz