put tethering bpf maps & programs in /sys/fs/bpf/tethering/... am: d8a4578f30 am: 2d62abc751

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/1552953

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I8a0a349c71396730a02a145112fc110a4d3446c3
tree: af3aa7d0539829b97c018231d1f571f62407ebd9
  1. bpfloader/
  2. libbpf_android/
  3. progs/
  4. Android.bp
  5. NOTICE
  6. OWNERS
  7. PREUPLOAD.cfg