add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# locally computed
sha256  63f6068ae36884adef4259bbb1fe2591755718f22c46d0a59d854883dfab1ffc  imx-bootlets-src-10.12.01.tar.gz