add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed:
sha256 810b3798d316394f94096ec2797909dbf23c858e48f7b3830826b8daa06b7b0f grub-2.02.tar.xz