core/sal: Added features that indicate whether FAIL* is initialized

GEM5 throws a reset trap during initialization.
This happens before the startup function is called.
This leads to problems because the startup function fills the m_CPUs list.
m_CPUs is needed for the TrapListener.
Therefore, we only react on traps after initialization.
This is needed in the following commit (see gem5/src/arch/arm/faults.cc).

Change-Id: I9ec6fd453705feb54b4f8a87d024181323a2d7ef

src/core/sal/SimulatorController.cc

@@ -50,6 +50,9 @@ void SimulatorController::startup()
 	std::cout << "[SimulatorController] Initializing..." << std::endl;
 	// TODO: Log-Level?
 
+	// Set Fail* as initialized
+	m_isInitialized = true;
+
 	// Activate previously added experiments to allow initialization:
 	initExperiments();
 }