add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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PLUTUX BOARD
M:    Alban Bedel <alban.bedel@avionic-design.de>
S:    Maintained
F:    board/avionic-design/plutux/
F:    include/configs/plutux.h
F:    configs/plutux_defconfig