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

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



Change-Id: Ice2c6951cf5b75db2b36af78045c4e091f854833
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>