kernel: invert session request handling flow

src/core/hle/service/service.h

@@ -20,6 +20,7 @@ class System;
 namespace Kernel {
 class HLERequestContext;
 class KClientPort;
+class KPort;
 class KServerSession;
 class ServiceThread;
 } // namespace Kernel
@@ -98,6 +99,9 @@ protected:
     /// Identifier string used to connect to the service.
     std::string service_name;
 
+    /// Port used by ManageNamedPort.
+    Kernel::KPort* named_port{};
+
 private:
     template <typename T>
     friend class ServiceFramework;