ResolverController - log NAT64 prefix in standard format am: ee259935 am: 403771af am: 9bbd4758 am: 8a6fd56a

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/1608477

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Id84abe52b2b29e7c52d4b1551be56cae353dfafc