Fix proguard rules for Struct in NetworkStack am: 9a82bbf368 am: 9aaeab539b

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1674688

Change-Id: I815875d909142ae2b1d860a3009daeafad23ab8c
tree: 648bac8c1461a382498811140308526737a4532c
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING