USB Wacom pressure pen on Android tablet doesn't work with QML.

Please see this attached sample program (tabletCanvasDrawing.zip).  It's an implementation of this Qt Sample.  It works fine on these configurations:

• (built-in) Wacom pressure pen/tablet on Linux
• USB Wacom tablet on macOS
• iPad Pro w/ Apple Pencil

I get the varying pressure sensitivity and it draws where I put the pen tip to.  Though, when I tried it out on an Kindle Fire 10 HD (Android), with the same USB Wacom tablet I used for macOS, it wasn't drawing at all.

Back in Qt 5.15.x, and when using a `QQuickWindow::tabletEvent()` overload, This "Kindle+USB Wacom" configuration worked.  So this should be supported by Qt.  (See QTBUG-97859 for one of my previous reports.)

**Because of this, I'm also concerned that the attached example might not work on Android tablets that have built in pressure pens.  E.g. A Samsung Galaxy Tab S6.

It also might be worth it to verify this works on Windows w/ pressure pens, but haven't tested that configuration yet.