add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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EVB-RK3399
M:      Kever Yang <kever.yang@rock-chips.com>
S:      Maintained
F:      board/rockchip/evb_rk3399
F:      include/configs/evb_rk3399.h
F:      configs/evb-rk3399_defconfig
F:      configs/firefly-rk3399_defconfig