Revert "Unhide IpPrefix(InetAddress, int)" am: 758ead6dd3 am: ea0caefdd2 am: 6c75679f1d am: 3b9f2fcc8c

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1927303

Change-Id: I92b3728e5ca20db17c6d5469f7bd8baf8e02b814