cam: camera_session: Access event loop through global instance

Don't pass the event loop to the CameraSession constructor, as passing
this global object explicitly isn't a design that can scale.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/cam/main.cpp

@@ -363,7 +363,7 @@ int CamApp::run()
 	}
 
 	if (options_.isSet(OptCapture)) {
-		CameraSession session(camera_, config_.get(), &loop_);
+		CameraSession session(camera_, config_.get());
 		return session.run(options_);
 	}