Synchronize window config updates (3/n)

Reroute DisplayListener#onDisplayChanged from WindowManager. It will be
invoked when display-related window configuration is changed, such as
bounds and rotation.

This is to ensure #onDisplayChanged will be invoked after Configuration
update.

Also fix an existing DisplayManagerGlobalTest that is constantly failing
in postsubmit.

Also cleanup Message used in DisplayListenerDelegate since it is no
longer a Handler.

Bug: 260873529
Test: atest FrameworksCoreTests:DisplayManagerGlobalTest
Change-Id: I99f8579b539e3839e84e20ce4be3d50b324e7379