add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From https://www.kernel.org/pub/software/network/ethtool/sha256sums.asc
sha256    b7c1a380007d30eaf261a63b3cfc000f9d93f9eb7626dcd48b5d2a733af99cba    ethtool-4.13.tar.xz
# Locally calculated
sha256    8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643    COPYING