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/multimedia/video/video.pri

@@ -0,0 +1,22 @@
+
+INCLUDEPATH += video
+
+PUBLIC_HEADERS += \
+    video/qabstractvideobuffer.h \
+    video/qabstractvideosurface.h \
+    video/qvideoframe.h \
+    video/qvideosurfaceformat.h
+
+PRIVATE_HEADERS += \
+    video/qabstractvideobuffer_p.h \
+    video/qimagevideobuffer_p.h \
+    video/qmemoryvideobuffer_p.h
+
+SOURCES += \
+    video/qabstractvideobuffer.cpp \
+    video/qabstractvideosurface.cpp \
+    video/qimagevideobuffer.cpp \
+    video/qmemoryvideobuffer.cpp \
+    video/qvideoframe.cpp \
+    video/qvideosurfaceformat.cpp
+