kern: implement KUnsafeMemory

mesosphere/kernel/source/kern_kernel_instantiations.cpp

@@ -27,6 +27,7 @@ namespace ams::kern {
     KBlockInfoManager       Kernel::s_block_info_manager;
     KSupervisorPageTable    Kernel::s_supervisor_page_table;
     KSynchronization        Kernel::s_synchronization;
+    KUnsafeMemory           Kernel::s_unsafe_memory;
     KWorkerTaskManager      Kernel::s_worker_task_managers[KWorkerTaskManager::WorkerType_Count];
 
     namespace {