Nested QML items with Accessible properties set does not work on Android

Nested QML items with accessibility info within another item with accessibility info does not show up in the accessibility hierarchy on Android.

See the output of Appium Inspector for a failing case below:

If the `Accessible.name` is removed from the nesting/parent element, the nested/child accessibility element `rect_inside_center` shows up in the Appium Inspector:

There is a minimal reproducer in the attached zip archive: NestedAccessibleItemsIssue.zip

An educated guess is that this was introduced in this commit:
https://codereview.qt-project.org/c/qt/qtbase/+/325940 

See the removal of addChild calls at line 339 here:
https://codereview.qt-project.org/c/qt/qtbase/+/325940/3/src/android/jar/src/org/qtproject/qt5/android/accessibility/QtAccessibilityDelegate.java#b339

(I have not tried to reintroduce the addChild code and compile Qt, so this is speculation.)

On iOS this is not an issue. (Tested.)