Clear mExtraDataKeys when clearing A11yNodeInfo.

Bug: 35244501
Test: Ran Accessibilitiy CTS. I can no longer get the test mentioned
in the bug to fail.

Change-Id: I69e5e1b5c8f12226837ced928fbd10ff77bcd235

core/java/android/view/accessibility/AccessibilityNodeInfo.java

@@ -3315,6 +3315,7 @@ public class AccessibilityNodeInfo implements Parcelable {
         mBoundsInScreen.set(0, 0, 0, 0);
         mBooleanProperties = 0;
         mDrawingOrderInParent = 0;
+        mExtraDataKeys = null;
         mPackageName = null;
         mClassName = null;
         mText = null;