add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally calculated
sha256 def599c86ab3606f7f67c0190e9b237fbc0cf934a951ffb1c5fb0c47d8a8f3d2    vexpress-firmware-901f81977c3b367a2e0bf3d6444be302822d97a3.tar.gz