file: add fd_raw cleanup class

So we can also use CLASS(fd_raw, f)(fd) for codepaths where we allow
FMODE_PATH aka O_PATH file descriptors to be used.

Signed-off-by: Christian Brauner <brauner@kernel.org>

include/linux/file.h

@@ -84,6 +84,7 @@ static inline void fdput_pos(struct fd f)
 }
 
 DEFINE_CLASS(fd, struct fd, fdput(_T), fdget(fd), int fd)
+DEFINE_CLASS(fd_raw, struct fd, fdput(_T), fdget_raw(fd), int fd)
 
 extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
 extern int replace_fd(unsigned fd, struct file *file, unsigned flags);