Move to f/l/n instead of RouteUtils am: adcec9ebbe am: d988d2c778 am: d21d556e50 am: 903b5df857

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1873892

Change-Id: I34c4985fc5b01358bda13409ad1d3a15fba85101