Refactor BPF map update logic of upstream interface change

Move upstream interface change handling for BPF map updates from
IpServer to BpfCoordinator. BpfCoordinator now manages all BPF map
updates.

Test: atest TetheringTests
Bug: 294025403
Change-Id: Idef1a6d1a16a35603e0b476bfdbe6a234f39f4be
4 files changed