[automerger skipped] Merge "Support learning the NAT64 prefix from two different sources." into rvc-dev am: 4f7f6d67e9 -s ours am: b2a05e3c42 -s ours
am skip reason: Change-Id Ic7452431d2d9aea1ae59b67a9d8383c6cc5b3902 with SHA-1 e2eade021a is in history
Change-Id: Id0c91aa087b90efc608f63f7ce0f133c0d7a59de
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