Update SplitController to use updated method names.

Add implementation of clearSplitListenerCallback.

Bug: 240265856
Test: atest CtsWindowManagerJetpackTestCases
Change-Id: I5cc141faf9b29426f00a60794dc7bb86894cb61f

libs/WindowManager/Jetpack/src/androidx/window/extensions/embedding/SplitController.java

@@ -239,6 +239,16 @@ public class SplitController implements JetpackTaskFragmentOrganizer.TaskFragmen
         }
     }
 
+    /**
+     * Clears the listener set in {@link SplitController#setSplitInfoListener}.
+     */
+    @Override
+    public void clearSplitInfoCallback() {
+        synchronized (mLock) {
+            mEmbeddingCallback = null;
+        }
+    }
+
     /**
      * Called when the transaction is ready so that the organizer can update the TaskFragments based
      * on the changes in transaction.