add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed
sha256 245ace9b2c50d6c13a804d9c4492a5a850c626e7537f0d0bad81670b2824892f  imx-lib-rel_imx_4.9.x_1.0.0_ga.tar.gz