tracefs: call fsnotify_{unlink,rmdir}() hooks

This will allow generating fsnotify delete events after the
fsnotify_nameremove() hook is removed from d_delete().

Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>