TetheringManager#tether() is deprecated and should not be used anymore,
especially for Wifi and Wifi P2P which already start and enable IpServer
based on WIFI_(AP/P2P)_STATE_CHANGED broadcast.
In order to refactor Tethering to only start IpServer with a final
TetheringRequest, we need to audit usage of tether() with Wifi and Wifi
P2P so that we can safely remove it from
Tethering.processInterfaceStateChanged (which starts an IpServer without
TetheringRequest in anticipation of a tether() call).
Bug: 216524590
Test: build
Change-Id: Ieb4bd14150a8b25257bee8ddc71e30037ec3a122
31f85c6aea