Support launching home activity on secondary display

- Add a new flag indicating that the display should show
  system decorations, such as status bar, nav bar, home and IME.
- Automatically launches home activity on secondary display
  if the display support system decorations and home
  activity has multiple instances supports.
- Remove ActivityStackSupervisor#mHomeStack and move several
  home stack related methods to ActivityDisplay.

Bug: 111363427
Test: atest ActivityManagerMultiDisplayTests
      atest com.android.server.am
      Manual test on virtual display and chromecast

Change-Id: I48fe245ad12965a19a6768f5dbb4e974ce94b01a