gnrc_rpl_control_messages: propagete prefix route via DAO message #4661
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Split from #4489.
If DAO message has targets with
prefix_length
< 128, add them to FIB withFIB_FLAG_NET_PREFIX
flag.If FIB has entries with
FIB_FLAG_NET_PREFIX
flag, set guessed prefix lengthes to DAO message. When #4279 is merged, this code should be also updated.