Kernel: Make self-contained locking smart pointers their own classes

Until now, our kernel has reimplemented a number of AK classes to
provide automatic internal locking:

- RefPtr
- NonnullRefPtr
- WeakPtr
- Weakable

This patch renames the Kernel classes so that they can coexist with
the original AK classes:

- RefPtr => LockRefPtr
- NonnullRefPtr => NonnullLockRefPtr
- WeakPtr => LockWeakPtr
- Weakable => LockWeakable

The goal here is to eventually get rid of the Lock* classes in favor of
using external locking.

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

@@ -14,12 +14,12 @@ namespace Kernel {
 
 class SysFSDeviceComponent final
     : public SysFSComponent
-    , public Weakable<SysFSDeviceComponent> {
+    , public LockWeakable<SysFSDeviceComponent> {
     friend class SysFSBlockDevicesDirectory;
     friend class SysFSCharacterDevicesDirectory;
 
 public:
-    static NonnullRefPtr<SysFSDeviceComponent> must_create(Device const&);
+    static NonnullLockRefPtr<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; }