test: geometry: Add tests for Size class comparison operators

Add a test that exercises all the comparison operators for the Size
class.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

test/meson.build

@@ -9,6 +9,7 @@ subdir('v4l2_subdevice')
 public_tests = [
     ['event',                           'event.cpp'],
     ['event-dispatcher',                'event-dispatcher.cpp'],
+    ['geometry',                        'geometry.cpp'],
     ['list-cameras',                    'list-cameras.cpp'],
     ['signal',                          'signal.cpp'],
     ['timer',                           'timer.cpp'],