htc: skeleton HtcsManagerImpl, implement HtcsMonitor

libraries/libstratosphere/source/htc/server/driver/htc_driver_manager.hpp

@@ -24,6 +24,8 @@ namespace ams::htc::server::driver {
             IDriver *m_driver;
         public:
             DriverManager(IDriver *driver) : m_driver(driver) { /* ... */ }
+
+            IDriver *GetDriver() { return m_driver; }
     };
 
 }