Use new DeployConfigurationFactory::addInitialStep in some cases

Less code, less classes.

Change-Id: I3ba9920f4f389e14c67cd8c5d937a4b4659865e7
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/ios/iosdeploystep.h

@@ -52,6 +52,7 @@ public:
 
     friend class IosDeployStepFactory;
     explicit IosDeployStep(ProjectExplorer::BuildStepList *bc);
+    static Core::Id stepId();
 
     bool fromMap(const QVariantMap &map) override;
     QVariantMap toMap() const override;