Android A11Y: populate child elements when constructing node info

This commit partly reverts 020a6f0dae.
It restores the code that is responsible for filling the children
for individual elements. Without this code, we have only top-level
element and its children in our accessibility hierarchy.

Fixes: QTBUG-100545
Pick-to: 6.3 6.2 5.15
Change-Id: I0604bbf5f1bdb0b3998a25fec7ed0a1fe554da8d
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

src/android/jar/src/org/qtproject/qt/android/accessibility/QtAccessibilityDelegate.java

@@ -387,6 +387,10 @@ public class QtAccessibilityDelegate extends View.AccessibilityDelegate
             node.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
         }
 
+        int[] ids = QtNativeAccessibility.childIdListForAccessibleObject(virtualViewId);
+        for (int i = 0; i < ids.length; ++i)
+            node.addChild(m_view, ids[i]);
+
         return node;
     }