hle: kernel: Refactor to allocate a ServiceThread per service handler.

- Previously, we would allocate a thread per session, which adds new threads on CloneCurrentObject.
- This results in race conditions with N sessions queuing requests to the same service interface.
- Fixes Pokken Tournament DX crashes/softlocks, which were regressed by #6347.

src/core/hle/service/sm/sm.cpp

@@ -46,7 +46,7 @@ Kernel::KClientPort& ServiceManager::InterfaceFactory(ServiceManager& self, Core
     self.sm_interface = sm;
     self.controller_interface = std::make_unique<Controller>(system);
 
-    return sm->CreatePort(system.Kernel());
+    return sm->CreatePort();
 }
 
 ResultVal<Kernel::KServerPort*> ServiceManager::RegisterService(std::string name,