ApfFilter - handle ipv4 frags correctly in mdns filter am: 97877376ad

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/2860307

Change-Id: If50f9ab9e0e958fb13a643c39da5a84fd60604a1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>