This adds the committed state to the display.
The `state` is used to set the correct power state (e.g. turning display on/off), however there was no way to know when this power state change finished. This new "committedState" aims to fulfill this gap.
DisplayListeners receives a `onDisplayChanged` callback whenever the power state change is fully committed, and can get this information from DisplayInfo.
This will be used in a follow up cl to improve unfold latency performances.
Bug: 223808403
Bug: 220690092
Bug: 197515205
Test: atest LocalDisplayAdapterTest && manual
Change-Id: Ia2fbab768b696c59578d974c88157ee3c8f3ddde
07c6ebdd97