Remove dead code. am: 2422319cb7 am: 9d288a6904 am: e91257ecf4

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1703126

Change-Id: If37743e00b8ef51f22fb167981e9a61f0349c05d
tree: 82ff5b99d44757c06dc36789dba356cebf45bf5a
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING