Expose NetworkScore to external caller am: 39907ba9d6

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1653938

Change-Id: I5f2fb6bb6f2de4d81fb3b750053ee5abbe82caeb
tree: c7e453a1472a4dc7348fd3fcc40a64ab85136fab
  1. framework/
  2. service/
  3. OWNERS
  4. TEST_MAPPING