Rename QtMultimediaKit to QtMultimedia.

There are a few legacy bits left in place so it passes CI, and
then qt5.git etc can be updated.

Change-Id: I6b082e50e6958c72fdabc2974992e16d90dafa3a
Reviewed-on: http://codereview.qt-project.org/5368
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>

src/imports/multimedia/multimedia.cpp

@@ -68,7 +68,8 @@ class QMultimediaDeclarativeModule : public QDeclarativeExtensionPlugin
 public:
     virtual void registerTypes(const char *uri)
     {
-        Q_ASSERT(QLatin1String(uri) == QLatin1String("Qt.multimediakit"));
+        Q_ASSERT(QLatin1String(uri) == QLatin1String("QtMultimedia")
+                || QLatin1String(uri) == QLatin1String("Qt.multimediakit"));
 
         qmlRegisterType<QSoundEffect>(uri, 4, 0, "SoundEffect");
         qmlRegisterType<QDeclarativeAudio>(uri, 4, 0, "Audio");