Improve BPF tethering counters. am: 72ec3ba88a am: 66609d3f3e

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I19117620a162ecf6a3c14118cebf3413ffbe667b
tree: e18c8f19ea0670c13af4b917cf2a36793d28a4b8
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING