Move doDns64Synthesis and doDns64ReverseLookup around
It needs to do a DNS64 synthesis or DNS64 reverse lookup only if the requester can do a DNS query or a reversed lookup. Move DNS64 handlings right after DNS (and reversed) lookups. Bug: 288340533 Test: atest Change-Id: I488bfb5e6dabe254769a1c199459c5960653038f
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