Creating interface name to index tracking for Bpf Maps.

Adding mechanism to track interaface name to interface index, this map
would be used by BpfNetMaps for storing interface index.

Bug: 400681214
Test: atest ConnectivityCoverageTests:android.net.connectivity.com.android.server.connectivity.InterfaceTrackerTest
Test: atest ConnectivityCoverageTests:android.net.connectivity.com.android.server.BpfNetMapsTest
Change-Id: I2a65cac908d9c4d10714e3fe26be20322d4a1db3
9 files changed