bearer-mbim: warn and workaround wrong link prefix length in static IPv6 config
Seems to happen with e.g. the Fibocom FM350:
# mmcli -b 2
------------------------------------
IPv6 configuration | method: static
| address: 2607:fb90:dd16:d38a:ac39:89f1:67a7:5a9d
| prefix: 128
| gateway: 2607:fb90:dd16:d38a:ac39:89f1:67a7:5a01
| dns: fd00:976a::9, fd00:976a::10
| mtu: 1436
Edited by Aleksander Morgado