[automerger skipped] Merge "Support learning the NAT64 prefix from two different sources." into rvc-dev am: 4f7f6d67e9 am: 5cb69679b1 -s ours
am skip reason: Change-Id Ic7452431d2d9aea1ae59b67a9d8383c6cc5b3902 with SHA-1 4308bfc4f0 is in history
Change-Id: Ic8af70ae1a29cda5cc6ef33f885db3532037de81
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