Use new DeployConfigurationFactory::addInitialStep in some cases

Less code, less classes.

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

src/plugins/remotelinux/remotelinuxdeployconfiguration.h

@@ -55,8 +55,6 @@ public:
         }
         return 0;
     }
-
-    void initialize() override;
 };
 
 namespace Internal {