Kernel: Update the ".." inode for directories after a rename

Because the ".." entry in a directory is a separate inode, if a
directory is renamed to a new location, then we should update this entry
the point to the new parent directory as well.

Co-authored-by: Liav A <liavalb@gmail.com>

Kernel/FileSystem/ProcFS/Inode.cpp

@@ -47,4 +47,9 @@ ErrorOr<void> ProcFSInode::chown(UserID, GroupID)
     return EPERM;
 }
 
+ErrorOr<void> ProcFSInode::replace_child(StringView, Inode&)
+{
+    return EROFS;
+}
+
 }