Move networkstats JNI to connectivity module am: 63d42a25bb am: 4dd383daec

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1987468

Change-Id: I81c331b1799c7bd728937da870e501378d599063
tree: afbc4fe94ed5acc66a30df4b45a15181f15bb072
  1. framework/
  2. framework-t/
  3. service-t/
  4. services/
  5. tests/