Merge "Mark NetworkAgentConfig fit for inclusion in stable AIDL" am: 66fbc7df52 am: 7fa31d50f2 am: bcea806f3d am: 6fac34befe

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1975026

Change-Id: I54463a602a49c270be3b76270c0e99ae545005ea