add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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config BR2_PACKAGE_DEVMEM2
    bool "devmem2"
    depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
    help
      Simple program to read/write from/to any location in memory.
 
      http://free-electrons.com/pub/mirror/devmem2.c