Kernel: Fixes, corrections and asserts to scheduler and different svcs.

src/core/hle/kernel/kernel.cpp

@@ -49,6 +49,7 @@ namespace Kernel {
  * @param cycles_late The number of CPU cycles that have passed since the desired wakeup time
  */
 static void ThreadWakeupCallback(u64 thread_handle, [[maybe_unused]] s64 cycles_late) {
+    UNREACHABLE();
     const auto proper_handle = static_cast<Handle>(thread_handle);
     const auto& system = Core::System::GetInstance();