[automerger skipped] Add getAverageLatencyMs in DnsStats am: 4b30ae6e -s ours am: 5595ecab -s ours

am skip reason: Merged-In I19eb25d18b1eb1ab97c7efc97d56ae9a315e4222 with SHA-1 4b30ae6e is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/14883337

Change-Id: I2b13130a2bd3346317d0a947e67ef7bf29669c46