增加sysfs接口

hc

2023-08-30 862c27fc9920c83318c784bfdadf43a65df1ec8f

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# From http://www.litech.org/radvd/dist/radvd-2.12.tar.gz.sha256
sha256    b070e77238e789e298a82cba2b1bfb0b0180b4ebc1adfc4e75058adfdbff747b    radvd-2.12.tar.xz