add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

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What:        /sys/class/net/<iface>/dsa/tagging
Date:        August 2018
KernelVersion:    4.20
Contact:    netdev@vger.kernel.org
Description:
        String indicating the type of tagging protocol used by the
        DSA slave network device.