updateLinkProperties copied the linkProperties in networkAgent,
but the clat fix-up function did not copy stacked link into new one.
This caused an incorrect clat iface removal, and the IPv4 network
to be unreachable.
Clean cherry-pick of ag/4260470
Bug: 80261579
Test: 1. ping after ipv6 only data call with 2g voice call on/off
2. runtest frameworks-net
3. run cts -m CtsNetTestCases
Change-Id: Ide47a3b0680dddfcf3e2e759a59b19aee3605050
4bbb9e3309