Fix a few header style violations.

Missing Q_MODULE or using moc keywords.

Change-Id: I3cb21799488c6f57c45d8e32862a49fadd083b99
Reviewed-by: Laszlo Papp <lpapp@kde.org>
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>

src/multimedia/controls/qmediaaudioprobecontrol.h

@@ -57,7 +57,7 @@ class Q_MULTIMEDIA_EXPORT QMediaAudioProbeControl : public QMediaControl
 public:
     virtual ~QMediaAudioProbeControl();
 
-signals:
+Q_SIGNALS:
     void audioBufferProbed(const QAudioBuffer &buffer);
     void flush();