Drop ARP packet in APF if the opcode is unknown am: e63d620672 am: d14fc81c2d am: 38a0a01c96

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/2840299

Change-Id: I6e9a1da1d4dea659930767c9821c8ae0a3591265
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>