Migrate hidden API in IpConfigStore to formal API am: ace9a3d468 am: 0994e5b8c4

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

Change-Id: I7ef352c7213864ee2ff99c5a2517fb1b9e68d1d2
tree: e3d52ae14cc200c6af9dd82e05a13a417baff222
  1. core/
  2. services/