add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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FIREFLY
M:    Simon Glass <sjg@chromium.org>
S:    Maintained
F:    board/firefly/firefly-rk3288
F:    include/configs/firefly-rk3288.h
F:    configs/firefly-rk3288_defconfig