[16/n] Create Overrides and Policy for AspectRatio

Flag: EXEMPT refactor
Bug: 350513585
Test: atest WmTests:LetterboxUiControllerTest
Test: atest WmTests:SizeCompatTests
Test: atest WmTests:TaskTests

Change-Id: If570bc1c3d4e33f769b6bf4b857bfedf6e5ca906
12 files changed