Emulator: Have the Settings page say "About emulated device"

The Settings page for a real device says "About phone" or
"About tablet". This text is selected at build time, so the
Emulator cannot get the Sytem to choose correctly at launch time.

Our solution is to say "About emulated device" for all types
of virtual devices.

Change-Id: Ia52c20b794f76230f5b73694fb193c18b173c329