Ensure VoiceInteractionManagerService updates the assistant setting

- Trigger the role changed callback manually when initializing the
  voice interaction manager in case the role handler changed prior to
  registering the listener.  In addition, ensure that we query for all
  packages regardless of current locked state.

Bug: 130126913
Test: Wipe device, restart and ensure that the assistant setting is set
      (adb shell setting get secure assistant)

Change-Id: I170189d9fd5177108c62c486e93b35a3a32af48c