Silence duplicate DNS prefetch requests am: 03bc8ba02d

Original change: https://android-review.googlesource.com/c/platform/packages/services/Iwlan/+/2168869

Change-Id: I02e46bce50fdd28a96eee00ea99399735a98cbcf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>