add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From http://brick.kernel.dk/snaps/MD5SUMS
md5    9a6ca62330c8adb0b6a4ea6cf8a55694    blktrace-1.1.0.tar.gz