kernel/Thread: move thread list into the manager

src/core/hle/kernel/svc.cpp

@@ -154,7 +154,7 @@ static void ExitProcess() {
     current_process->status = ProcessStatus::Exited;
 
     // Stop all the process threads that are currently waiting for objects.
-    auto& thread_list = GetThreadList();
+    auto& thread_list = kernel.GetThreadManager().GetThreadList();
     for (auto& thread : thread_list) {
         if (thread->owner_process != current_process)
             continue;