Add kill switch flag for ARP offload in APF am: 751bf1bcaf

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/3130993

Change-Id: I07e5dc52930ddd7a2ec49f090abccaf6fce6f413
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>