Change logging level from ERROR to INFO for no DNS64 prefix
Actually, it is not an error because the network environment may not have a NAT64 server. Bug: 140714781 Test: atest Merged-In: Id7ad35914ac9736c9c465dce9f7b21fdffe76fa7 Change-Id: I6c5ca8b1951f57d8f04af7eca681bb23ce0d4e37 (cherry picked from commit e6b7f170)
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