add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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ETHERNUT5 BOARD
M:    egnite GmbH <info@egnite.de>
S:    Maintained
F:    board/egnite/ethernut5/
F:    include/configs/ethernut5.h
F:    configs/ethernut5_defconfig