Revert "NetBpfLoad: gently enable mainline" am: 2afffc2d6a

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3134201

Change-Id: I311dfb084ffae8edd94845a6cbe693bfb9be83be
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>