Improve BPF tethering counters. am: 72ec3ba88a

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1580284

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I43e2306bf134e2219b9f0a5bb59ad9c03f3aaa70
tree: 3194ac6d686eee2cd663a1ae7b48313130eff7c0
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING