scftorture: Remove unused SCFTORTOUT

There are no longer any users of SCFTORTOUT(), so this commit removes it.

Acked-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Li Zhijian <zhijianx.li@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>