[58/n] Handle Cutout in Letterbox Surface bounds

Letterbox Surfaces bounds need to take cut out into
account. This is done using the information provided by
the LetterboxPolicy.

Flag: EXEMPT Refactoring
Bug: 377289720
Test: atest WmTests:AppCompatUtilsTest
Test: atest WmTests:TransitionTests

Change-Id: I9f94d9f4f0122edb7e02f36a8df9bffc0fd505d0