core: Add support for N3DS memory mappings (#5103)

* core: Add support for N3DS memory mappings

* Address review comments

src/core/hle/kernel/kernel.h

@@ -86,7 +86,7 @@ class KernelSystem {
 public:
     explicit KernelSystem(Memory::MemorySystem& memory, Core::Timing& timing,
                           std::function<void()> prepare_reschedule_callback, u32 system_mode,
-                          u32 num_cores);
+                          u32 num_cores, u8 n3ds_mode);
     ~KernelSystem();
 
     using PortPair = std::pair<std::shared_ptr<ServerPort>, std::shared_ptr<ClientPort>>;
@@ -263,7 +263,7 @@ public:
     Core::Timing& timing;
 
 private:
-    void MemoryInit(u32 mem_type);
+    void MemoryInit(u32 mem_type, u8 n3ds_mode);
 
     std::function<void()> prepare_reschedule_callback;