add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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STMARK2 BOARD
M:    Angelo Dureghello <angelo@sysam.it>
S:    Maintained
F:    board/sysam/stmark2/
F:    include/configs/stmark2.h
F:    configs/stmark2_defconfig