c750566a77
Currently, Ethernet only supports interfaces in client mode (e.g., to connect to the Internet). Add minimal support to Ethernet to support interfaces in server mode. This simple implementation only works on the default interface, which is the first interface that is detected on boot (even if the interface is later removed). This also provides (but does not yet unhide) a simple API for Tethering to request that the next-plugged-in interface to be placed into server mode. Test: Enabling tethering with change on top Bug: 130840861 Change-Id: I78f85bc36aaceb62ce274003a75ea99d0b6bc8b7