add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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DS109 BOARD
M:    Walter Schweizer <swwa@users.sourceforge.net>
S:    Maintained
F:    board/Synology/ds109
F:    configs/ds109_defconfig
F:    include/configs/ds109.h