Foldables: Add IDisplayFoldListener

Include ag/5663399 to unregister display fold listener.

Bug: 123245311
Test: atest WmTests
Change-Id: I60776fddd4a671b7443cd33220271fed84503b27
diff --git a/Android.bp b/Android.bp
index 9584767..eafb605 100644
--- a/Android.bp
+++ b/Android.bp
@@ -376,6 +376,7 @@
         "core/java/android/view/IApplicationToken.aidl",
         "core/java/android/view/IAppTransitionAnimationSpecsFuture.aidl",
         "core/java/android/view/IDockedStackListener.aidl",
+        "core/java/android/view/IDisplayFoldListener.aidl",
         "core/java/android/view/IGraphicsStats.aidl",
         "core/java/android/view/IGraphicsStatsCallback.aidl",
         "core/java/android/view/IInputFilter.aidl",