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/PowerStateSwitch.h

@@ -7,12 +7,12 @@
 
 #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/KBuffer.h>
+#include <Kernel/Library/LockRefPtr.h>
 #include <Kernel/Memory/MappedROM.h>
 #include <Kernel/Memory/Region.h>
 #include <Kernel/PhysicalAddress.h>
@@ -23,7 +23,7 @@ namespace Kernel {
 class PowerStateSwitchNode final : public SysFSComponent {
 public:
     virtual StringView name() const override { return "power_state"sv; }
-    static NonnullRefPtr<PowerStateSwitchNode> must_create(FirmwareSysFSDirectory&);
+    static NonnullLockRefPtr<PowerStateSwitchNode> must_create(FirmwareSysFSDirectory&);
     virtual mode_t permissions() const override;
     virtual ErrorOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) override;
     virtual ErrorOr<void> truncate(u64) override;