add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 617c70dcf50b7ad35ed3f40666ff2a9a654a5440b522ad73662abdf9f843cee9  ts4800-mbrboot-cf8f7072ed5a4a4e48fcb9841b2e31e519ec5dca.tar.gz