Initialize callbacks in fuzzer am: 857ece4f am: 68de805a am: a2af062b...

Initialize callbacks in fuzzer am: 857ece4f am: 68de805a am: a2af062b am: d7a666d3 am: e18a7864

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2469762



Change-Id: Ic5939f08d772741fc46b442b21f3d7bdac25176f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>