Kernel: pass ref down to Object and wrap ID counter into kernel state

src/core/hle/kernel/object.cpp

@@ -3,10 +3,13 @@
 // Refer to the license.txt file included.
 
 #include "common/assert.h"
+#include "core/hle/kernel/kernel.h"
 #include "core/hle/kernel/object.h"
 
 namespace Kernel {
 
+Object::Object(KernelSystem& kernel) : object_id{kernel.GenerateObjectID()} {}
+
 Object::~Object() = default;
 
 bool Object::IsWaitable() const {