Add the spot for spot metering mode.

Not yet fully documented in QML - needs a bit of an overhaul first.

Change-Id: Ic11684858fb872d0b4dcedf60b390571371db252
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>

src/imports/multimedia/qdeclarativecamera_p.h

@@ -104,6 +104,7 @@ class QDeclarativeCamera : public QObject, public QDeclarativeParserStatus
 
     Q_ENUMS(FlashMode)
     Q_ENUMS(ExposureMode)
+    Q_ENUMS(MeteringMode)
 
     Q_ENUMS(FocusMode)
     Q_ENUMS(FocusPointMode)
@@ -164,6 +165,12 @@ public:
         ExposureModeVendor = QCameraExposure::ExposureModeVendor
     };
 
+    enum MeteringMode {
+        MeteringMatrix = QCameraExposure::MeteringMatrix,
+        MeteringAverage = QCameraExposure::MeteringAverage,
+        MeteringSpot = QCameraExposure::MeteringSpot
+    };
+
     enum FocusMode {
         FocusManual = QCameraFocus::ManualFocus,
         FocusHyperfocal = QCameraFocus::HyperfocalFocus,