Fix proguard rules for Struct in NetworkStack am: 9a82bbf368

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

Change-Id: I49cf42126e03c4fd449577bd1167dd74dec1b6a5
tree: c556cd98b772a1d9776a4153b06a0924ff089915
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING