hle: kernel: Unify and integrate reference tracking for KServerPort/KServerSession.

- These are not managed elsewhere, and need to be tracked and closed on emulation shutdown.

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

@@ -153,6 +153,7 @@ ResultVal<Kernel::KClientSession*> SM::GetServiceImpl(Kernel::HLERequestContext&
     auto& port = port_result.Unwrap();
     SCOPE_EXIT({ port->GetClientPort().Close(); });
 
+    kernel.RegisterServerObject(&port->GetServerPort());
 
     // Create a new session.
     Kernel::KClientSession* session{};