Move SshKeyCreationDialog into RemoteLinux plugin

It's being used only there.

Change-Id: Ie2917f34268eba3ada4f152d3feeaa4130350236
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/remotelinux/genericlinuxdeviceconfigurationwidget.cpp

@@ -26,13 +26,14 @@
 #include "genericlinuxdeviceconfigurationwidget.h"
 #include "ui_genericlinuxdeviceconfigurationwidget.h"
 
+#include "sshkeycreationdialog.h"
+
 #include <coreplugin/coreconstants.h>
 #include <projectexplorer/devicesupport/idevice.h>
 #include <utils/portlist.h>
 #include <utils/fancylineedit.h>
 #include <utils/utilsicons.h>
 #include <ssh/sshparameters.h>
-#include <ssh/sshkeycreationdialog.h>
 
 using namespace ProjectExplorer;
 using namespace RemoteLinux;