Debugger: Merge EngineSetup and InferiorSetup start phases

It was needed in the past to trigger e.g. gdbserver setup in
remote cases which is nowadays handled by separate RunWorkers.

Change-Id: I30bce071dab0779cce2e7abef7b31550d8539461
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/debugger/pdb/pdbengine.cpp

@@ -153,13 +153,6 @@ void PdbEngine::setupEngine()
     notifyEngineSetupOk();
 }
 
-void PdbEngine::setupInferior()
-{
-    QTC_ASSERT(state() == InferiorSetupRequested, qDebug() << state());
-
-    notifyInferiorSetupOk();
-}
-
 void PdbEngine::runEngine()
 {
     QTC_ASSERT(state() == EngineRunRequested, qDebug() << state());