In order to hide mouse cursor on IMX6 it was enough to set it to Cursor.NONE for both the Scene and the root parent.

On Odroid U3 it seems to behave a bit randomly:
- Initially I observed it to be hiding mouse cursor.
- At some point the size of main window has changed (became less than full screen) and cursor started to appear again
- When it was happening, if you plug-in mouse (by default it is only a touch screen connected) and move it around there were areas where it was disappearing completely
- After more changes to code it started to always appear again.
- While it is happening, if you plug-in mouse and then unplug it, the cursor disappears