add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256 da04cffc306d9738abdc67d234b8948db6ca97ed77760c68d99d18817839a513 rtl8723bu-b922079a090dcaad58179d478442ff97f18521c9.tar.gz