Fix out of date comment in the APF Arp filter am: 72488ca020

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/2840298

Change-Id: I251869139d5a4b483f7fa7ed511bd47615283abd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>