add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From http://downloads.yoctoproject.org/releases/matchbox/matchbox-keyboard/0.1/matchbox-keyboard-0.1.tar.bz2.md5
md5    50940321d59fee23b38a4941100abf25    matchbox-keyboard-0.1.tar.bz2