add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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Recursive inclusion detected.
Inclusion path:
  current file : Kconfig.inc1
  included from: Kconfig.inc3:1
  included from: Kconfig.inc2:3
  included from: Kconfig.inc1:4