add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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Technexion PICO-IMX7D board
M:    Vanessa Maegima <vanessa.maegima@nxp.com>
S:    Maintained
F:    board/technexion/pico-imx7d/
F:    include/configs/pico-imx7d.h
F:    configs/pico-imx7d_defconfig