test: Add scale li_fixed overflow test

test: Add scale li_fixed overflow test

Add a test case and test device that checks if the scale transform can
handle high resolution devices and output monitor resolutions.

The test case is created in a way that it will fail if the coordinate
transform expression will overflow if only 32 bit integer data
containers are used.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>