Merge "Revert "Suppress NewApi warnings for @SystemApi -> public APIs"" am: 9a3f0adc35 am: e4147865ee am: 71dda95890 am: 2457ab8314

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1927300

Change-Id: I2ce50f71567376b85dab6336a9d397bb5f136b07