add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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config BR2_PACKAGE_PYTHON_ECDSA
    bool "python-ecdsa"
    help
      ECDSA cryptographic signature library (pure python).
 
      http://github.com/warner/python-ecdsa