add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# From https://www.kernel.org/pub/software/network/tftp/tftp-hpa/sha256sums.asc
sha256    afee361df96a2f88344e191f6a25480fd714e1d28d176c3f10cc43fa206b718b    tftp-hpa-5.2.tar.xz