hsr: drop supervision-address from HSR setting
hsr: drop supervision-address from HSR setting
The supervision address is read-only. It is constructed by kernel and only the last byte can be modified by setting the multicast-spec as documented indeed.
As 1.46 was not released yet, we still can drop the whole API for this setting property. We are keeping the NMDeviceHsr property as it is a nice to have for reading it.
Fixes: 5426bdf4 ('HSR: add support to HSR/PRP interface')