link: Add function to unset carrier request #2
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When fetching from the kernel this flag seems to be set and when making a change request this persists. Since it's only internal variables we need a function to unset it from the outside.
ndo_carrier_change in the kernel should only be implemented by non-hardware interfaces. For hardware interfaces (e.g. physical ports) it will be EOPNOTSUPP. Allow unsetting it to not get an error.