add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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config BR2_PACKAGE_MPFR
    bool "mpfr"
    select BR2_PACKAGE_GMP
    help
      C library for multiple-precision floating-point computations
      with exact rounding.
 
      http://www.mpfr.org/