ApfFilter - handle ipv4 frags correctly in mdns filter am: 97877376ad am: 0c666d39ca am: 656b61d545

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

Change-Id: I1e02e09eeb0d682e32b787fa20269faa33fdc614
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>