Experimental: Fix imports

Change-Id: I4d3abf9efb3a0ea53aca603ba28f05e912f9ffb4
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

src/experimental/Dial.qml

@@ -40,6 +40,7 @@
 
 import QtQuick 2.1
 import QtQuick.Controls 1.0
+import QtQuick.Controls.Private 1.0
 
 /*!
     \qmltype Dial

src/experimental/Dialog.qml

@@ -41,6 +41,7 @@
 import QtQuick 2.1
 import QtQuick.Window 2.1
 import QtQuick.Controls 1.0
+import QtQuick.Controls.Private 1.0
 
 /*!
     \qmltype Dialog

tests/manual/Dialog.qml

@@ -39,7 +39,7 @@
 ****************************************************************************/
 
 import QtQuick 2.1
-import QtQuick.Controls 1.0
+import QtQuick.Controls.Experimental 1.0
 
 Rectangle {
     width: 300