add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256 f1e7067aac5b62b67b8b6e4c517990277804339ac16065eb13c731ff909ae46f broadcom-wl-5.100.138.tar.bz2
sha256 26a8c370f48fc129d0731cfd751c36cae1419b0bc8ca35781126744e60eae009 broadcom-wl-5.10.56.27.3_mipsel.tar.bz2