Refactor DisplayCutout to use Rect instead of Region.

Test: unittest
Bug: 112296834

Change-Id: I4245543c26f99afa59a34f5b6e6650b93d052a6e

packages/SystemUI/src/com/android/systemui/RegionInterceptingFrameLayout.java

@@ -76,7 +76,7 @@ public class RegionInterceptingFrameLayout extends FrameLayout {
                 continue;
             }
 
-            internalInsetsInfo.touchableRegion.op(riv.getInterceptRegion(), Op.UNION);
+            internalInsetsInfo.touchableRegion.op(unionRegion, Op.UNION);
         }
     };