Fix NetworkController no longer tracking userSetup

A previous refactor of DeviceProvisionedController removed the semantics
of getting a callback when adding a new listner. This change lets
NetworkController check the initial state after registering for updates,
and removes the doAnswer call from NetworkControllerBaseTest to mimic
this behavior

Also add the field to dumpsys

Test: manual; check `adb shell -n dumpsys activity service com.android.systemui/.SystemUIService | grep -A1 "NetworkController state:"`
Test: atest SystemUITests
Bug: 210512851
Change-Id: I82c8b15ad1b2d43494fa28178715ea0d0721fea7