cpu_core: Separate cpu_core and memory

This makes cpu_core and memory being completely independent components inside the system, having a simpler and more understandable initialization process
The thread which casues page table changes in memory will be responsible to notify the cpu_core too

src/core/hle/kernel/thread.cpp

@@ -114,6 +114,7 @@ void ThreadManager::SwitchContext(Thread* new_thread) {
             kernel.SetCurrentProcess(SharedFrom(current_thread->owner_process));
             kernel.memory.SetCurrentPageTable(
                 &current_thread->owner_process->vm_manager.page_table);
+            cpu->PageTableChanged(); // notify the CPU the page table in memory has changed
         }
 
         cpu->LoadContext(new_thread->context);