add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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BLANCHE BOARD
M:    Masakazu Mochizuki <masakazu.mochizuki.wd@hitachi.com>
S:    Maintained
F:    board/renesas/blanche/
F:    include/configs/blanche.h
F:    configs/blanche_defconfig