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: I0e3248ffd0fbc950b54910e41a1c3d718d55c3ed
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>