test: Add EventNotifier thread move test

The test verifies correct behaviour of an enabled event notifier moved
to a different thread.

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

test/meson.build

@@ -23,6 +23,7 @@ public_tests = [
 
 internal_tests = [
     ['camera-sensor',                   'camera-sensor.cpp'],
+    ['event-thread',                    'event-thread.cpp'],
     ['message',                         'message.cpp'],
     ['object',                          'object.cpp'],
     ['object-invoke',                   'object-invoke.cpp'],