Remove NAPT from PacketForwarder am: 74acb88d03

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2901358

Change-Id: Ib7e74b2b2ce9194f3028f29ffb2ca52901ddf259
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>