Kernel/SysFS: Rename Devices code folder => DeviceIdentifiers

This folder in the SysFS code represents everything related to /sys/dev,
which is a directory meant to be a convenient interface to track all IDs
of all block and character devices (ID = major:minor numbers).

Kernel/FileSystem/SysFS/Subsystems/DeviceIdentifiers/DeviceComponent.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/IntrusiveList.h>
+#include <Kernel/FileSystem/SysFS/Component.h>
+#include <Kernel/KString.h>
+
+namespace Kernel {
+
+class SysFSDeviceComponent final
+    : public SysFSComponent
+    , public Weakable<SysFSDeviceComponent> {
+    friend class SysFSComponentRegistry;
+
+public:
+    static NonnullRefPtr<SysFSDeviceComponent> must_create(Device const&);
+    virtual StringView name() const override { return m_major_minor_formatted_device_name->view(); }
+    bool is_block_device() const { return m_block_device; }
+
+private:
+    SysFSDeviceComponent(NonnullOwnPtr<KString> major_minor_formatted_device_name, Device const&);
+    IntrusiveListNode<SysFSDeviceComponent, NonnullRefPtr<SysFSDeviceComponent>> m_list_node;
+    bool m_block_device;
+
+    NonnullOwnPtr<KString> m_major_minor_formatted_device_name;
+};
+
+}