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/File.h

@@ -8,11 +8,11 @@
 
 #include <AK/AtomicRefCounted.h>
 #include <AK/Error.h>
-#include <AK/NonnullRefPtr.h>
 #include <AK/StringView.h>
 #include <AK/Types.h>
-#include <AK/Weakable.h>
 #include <Kernel/Forward.h>
+#include <Kernel/Library/LockWeakable.h>
+#include <Kernel/Library/NonnullLockRefPtr.h>
 #include <Kernel/UnixTypes.h>
 #include <Kernel/UserOrKernelBuffer.h>
 #include <Kernel/VirtualAddress.h>
@@ -72,13 +72,13 @@ public:
 
 class File
     : public AtomicRefCounted<File>
-    , public Weakable<File> {
+    , public LockWeakable<File> {
 public:
     virtual bool unref() const { return AtomicRefCounted<File>::unref(); }
     virtual void will_be_destroyed() { }
     virtual ~File();
 
-    virtual ErrorOr<NonnullRefPtr<OpenFileDescription>> open(int options);
+    virtual ErrorOr<NonnullLockRefPtr<OpenFileDescription>> open(int options);
     virtual ErrorOr<void> close();
 
     virtual bool can_read(OpenFileDescription const&, u64) const = 0;