kernel/timer: add TimerManager for timer system states

src/core/hle/kernel/kernel.h

@@ -29,6 +29,7 @@ class ServerSession;
 class ResourceLimitList;
 class SharedMemory;
 class ThreadManager;
+class TimerManager;
 
 enum class ResetType {
     OneShot,
@@ -191,6 +192,9 @@ public:
     ThreadManager& GetThreadManager();
     const ThreadManager& GetThreadManager() const;
 
+    TimerManager& GetTimerManager();
+    const TimerManager& GetTimerManager() const;
+
 private:
     std::unique_ptr<ResourceLimitList> resource_limits;
     std::atomic<u32> next_object_id{0};
@@ -205,6 +209,7 @@ private:
     SharedPtr<Process> current_process;
 
     std::unique_ptr<ThreadManager> thread_manager;
+    std::unique_ptr<TimerManager> timer_manager;
 };
 
 } // namespace Kernel