Added QCamera::UnloadingStatus and StoppingStatus values.

These statuses are useful when the camera is stopped and/or unloaded
asynchronously. Previously the status was changed to
LoadedStatus or UnloadedStatus immediately,
even while camera was still active.

Change-Id: Id11021a150b0d34791ea631d7a62086cc0727220
Reviewed-by: Mithra Pattison <mithra.pattison@nokia.com>
Reviewed-by: Ling Hu <ling.hu@nokia.com>

src/multimedia/camera/qcamera.h

@@ -90,9 +90,11 @@ public:
         UnavailableStatus,
         UnloadedStatus,
         LoadingStatus,
+        UnloadingStatus,
         LoadedStatus,
         StandbyStatus,
         StartingStatus,
+        StoppingStatus,
         ActiveStatus
     };