Android: Use avdmanager tool

android tool is deprecated since sdk tools version 25.3.0.
Use the new avdmanager tool

Task-number: QTCREATORBUG-17814
Change-Id: Id6f495f14e12d0069df08164cac1929b76d9e932
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

src/plugins/android/avddialog.h

@@ -32,6 +32,7 @@
 
 namespace Android {
 class AndroidConfig;
+class SdkPlatform;
 
 namespace Internal {
 
@@ -42,7 +43,7 @@ public:
     explicit AvdDialog(int minApiLevel, const QString &targetArch,
                        const AndroidConfig *config, QWidget *parent = 0);
 
-    QString target() const;
+    Android::SdkPlatform target() const;
     QString name() const;
     QString abi() const;
     int sdcardSize() const;