Adding stacked link addresses to local_net_access map

Iterating over stacked link address to ensure correct mapping for
interface to local network ip prefixes.

Bug: 369815823
Test: atest ConnectivityCoverageTests:android.net.connectivity.com.android.server.BpfNetMapsTest
Test: atest ConnectivityCoverageTests:android.net.connectivity.com.android.server.CSLocalNetworkProtectionTest
Change-Id: I3b2ed906caf43584ffb0e8041f9302c760099f7b
2 files changed