add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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TK1-SOM BOARD
M:    Peter.Chubb@data61.csiro.au
S:    Maintained
F:    board/cei/tk1-som/
F:    include/configs/cei-tk1-som.h
F:    configs/cei-tk1-som_defconfig