add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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CONFIG_BASE_DEFCONFIG="rk3588_defconfig"
CONFIG_ROCKCHIP_EARLY_DISTRO_DTB=y
CONFIG_ROCKCHIP_EARLY_DISTRO_DTB_PATH="/extlinux/toybrick.dtb"