torture: Add MODULE_DESCRIPTION()

Fix the 'make W=1' warning:

WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/torture.o

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

Author: jeff-t-johnson

kernel/torture.c

@@ -40,6 +40,7 @@
 #include <linux/sched/rt.h>
 #include "rcu/rcu.h"
 
+MODULE_DESCRIPTION("Common functions for in-kernel torture tests");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com>");