Fix flickering of screen resolution change with deferred updater

Before this change, the execution order from
DeferredDisplayUpdater#requestDisplayChangeTransition is:
1. startCollectOrQueue
2. onStartCollect.run()
3. reconfigureDisplayLocked
4. requestChangeTransitionIfNeeded(collect display)
5. setDisplaySyncMethod

WindowState#prepareSync with check the sync method in step 4,
so it still uses non-blast sync, which causes the display cutout
to not sync with display resize.

This change reorders 4 and 5, so the behavior will be the same
as ImmediateDisplayUpdater, i.e. the previous original behavior.

Also removed setAllReady to let setReady() be called for individual
display from WindowOrganizerController#startTransition ->
applyDisplayChangeIfNeeded. That avoids potential too-early-ready.
This is also to restore to previous original behavior.

Bug: 318679910
Test: DisplayContentDeferredUpdateTests
Test: Toggle screen resolution rapidly without flickering cutout.

Change-Id: I68385ec62c72e0b3afbefd808cc95cd6995ea542