add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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ALT BOARD
M:    Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
S:    Maintained
F:    board/renesas/alt/
F:    include/configs/alt.h
F:    configs/alt_defconfig