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/service.cpp

@@ -93,8 +93,8 @@ namespace Service {
 
 ServiceFrameworkBase::ServiceFrameworkBase(Core::System& system_, const char* service_name_,
                                            u32 max_sessions_, InvokerFn* handler_invoker_)
-    : system{system_}, service_name{service_name_}, max_sessions{max_sessions_},
-      handler_invoker{handler_invoker_} {}
+    : SessionRequestHandler(system_.Kernel(), service_name_), system{system_},
+      service_name{service_name_}, max_sessions{max_sessions_}, handler_invoker{handler_invoker_} {}
 
 ServiceFrameworkBase::~ServiceFrameworkBase() {
     // Wait for other threads to release access before destroying
@@ -111,7 +111,7 @@ void ServiceFrameworkBase::InstallAsService(SM::ServiceManager& service_manager)
     port_installed = true;
 }
 
-Kernel::KClientPort& ServiceFrameworkBase::CreatePort(Kernel::KernelCore& kernel) {
+Kernel::KClientPort& ServiceFrameworkBase::CreatePort() {
     const auto guard = LockService();
 
     ASSERT(!port_installed);