[hal] Update runtime enum to allow selecting roborio 2 (#3565)

In some cases, knowing roborio 2 might be useful. This also creates a higher level enum that might be usable later for the discussion on more complex runtime types.

hal/src/main/native/sim/HAL.cpp

@@ -51,7 +51,7 @@ class SimPeriodicCallbackRegistry : public impl::SimCallbackRegistryBase {
 };
 }  // namespace
 
-static HAL_RuntimeType runtimeType{HAL_Mock};
+static HAL_RuntimeType runtimeType{HAL_Runtime_Simulation};
 static wpi::spinlock gOnShutdownMutex;
 static std::vector<std::pair<void*, void (*)(void*)>> gOnShutdown;
 static SimPeriodicCallbackRegistry gSimPeriodicBefore;