add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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DB_88F6720 BOARD
M:    Stefan Roese <sr@denx.de>
S:    Maintained
F:    board/Marvell/db-88f6720/
F:    include/configs/db-88f6720.h
F:    configs/db-88f6720_defconfig