Use QCameraInfo in camera example.

To replace QCamera::availableDevices(), which is deprecated since 5.3.

Change-Id: I0b1bd6286ec78d6d26ce309d224369989d4a5063
Reviewed-by: Christian Stromme <christian.stromme@digia.com>

examples/multimediawidgets/camera/camera.h

@@ -60,7 +60,7 @@ public:
     ~Camera();
 
 private slots:
-    void setCamera(const QByteArray &cameraDevice);
+    void setCamera(const QCameraInfo &cameraInfo);
 
     void startCamera();
     void stopCamera();