kernel/shared_memory: Make data members private

Rather than allow unfettered access to the class internals, we hide all
members by default and create and API that other code can operate
against.

src/core/hle/service/mic_u.cpp

@@ -40,7 +40,7 @@ struct MIC_U::Impl {
         shared_memory = rp.PopObject<Kernel::SharedMemory>();
 
         if (shared_memory) {
-            shared_memory->name = "MIC_U:shared_memory";
+            shared_memory->SetName("MIC_U:shared_memory");
         }
 
         IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);