kernel: Move object class to its own source files

General moving to keep kernel object types separate from the direct
kernel code. Also essentially a preliminary cleanup before eliminating
global kernel state in the kernel code.

src/core/hle/service/sm/sm.h

@@ -4,9 +4,11 @@
 
 #pragma once
 
+#include <memory>
 #include <string>
 #include <unordered_map>
-#include "core/hle/kernel/kernel.h"
+
+#include "core/hle/kernel/object.h"
 #include "core/hle/result.h"
 #include "core/hle/service/service.h"
 
@@ -19,6 +21,8 @@ class SessionRequestHandler;
 
 namespace Service::SM {
 
+class Controller;
+
 /// Interface to "sm:" service
 class SM final : public ServiceFramework<SM> {
 public:
@@ -32,8 +36,6 @@ private:
     std::shared_ptr<ServiceManager> service_manager;
 };
 
-class Controller;
-
 constexpr ResultCode ERR_SERVICE_NOT_REGISTERED(-1);
 constexpr ResultCode ERR_MAX_CONNECTIONS_REACHED(-1);
 constexpr ResultCode ERR_INVALID_NAME_SIZE(-1);