platform: track ifa_flags for cached IPv4 addresses
It's useful to track the flags for IPv4 addresses too. - we might want to sort IPv4 addresses according to whether they are permanent or dynamic. - later we want to set IFA_F_NOPREFIXROUTE also for IPv4 addresses. While the ability to "set" a flag doesn't necessarily require that we also keep the flags present in NMPlatformIP4Address, it is more consistent.
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