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/Firmware/BIOS/Directory.h

@@ -6,11 +6,11 @@
 
 #pragma once
 
-#include <AK/RefPtr.h>
 #include <AK/Types.h>
 #include <AK/Vector.h>
 #include <Kernel/FileSystem/SysFS.h>
 #include <Kernel/FileSystem/SysFS/Subsystems/Firmware/Directory.h>
+#include <Kernel/Library/LockRefPtr.h>
 #include <Kernel/PhysicalAddress.h>
 
 namespace Kernel {
@@ -18,7 +18,7 @@ namespace Kernel {
 class BIOSSysFSDirectory : public SysFSDirectory {
 public:
     virtual StringView name() const override { return "bios"sv; }
-    static NonnullRefPtr<BIOSSysFSDirectory> must_create(FirmwareSysFSDirectory&);
+    static NonnullLockRefPtr<BIOSSysFSDirectory> must_create(FirmwareSysFSDirectory&);
 
     void create_components();