DisplayController should deep compare mPerDisplayBounds

- In CHANGE_SUPPORTED_BOUNDS check, it uses Map.equals, but as the value is a primitive array WindowBounds[], equals check does not deep compare the arrays and may result in false negative
- One example is when fontScale changes, DisplayController re-create bounds from WindowManagerProxy, result in new WindowBounds[] created, and the shallow compare results in unexpected CHANGE_SUPPORTED_BOUNDS

Fix: 282736623
Test: DisplayControllerTest
Change-Id: I3897595c58559192b951ecfee7c9f62a07dafe1f