Migrate hidden API in IpConfigStore to formal API am: ace9a3d468

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1577123

Change-Id: I218559824dc81cc1b57f17ef43f3fb29ec0fc4f5
tree: e3d52ae14cc200c6af9dd82e05a13a417baff222
  1. core/
  2. services/