rcutorture: Add missing MODULE_DESCRIPTION() macros

Fix the following 'make W=1' warnings:

WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/rcu/rcutorture.o
WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/rcu/rcuscale.o
WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/rcu/refscale.o

Signed-off-by: Jeff Johnson <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

Author: Jeff Johnson

kernel/rcu/rcuscale.c

@@ -42,6 +42,7 @@
 
 #include "rcu.h"
 
+MODULE_DESCRIPTION("Read-Copy Update module-based scalability-test facility");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Paul E. McKenney <[email protected]>");
 

kernel/rcu/rcutorture.c

@@ -51,6 +51,7 @@
 
 #include "rcu.h"
 
+MODULE_DESCRIPTION("Read-Copy Update module-based torture test facility");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Paul E. McKenney <[email protected]> and Josh Triplett <[email protected]>");
 

kernel/rcu/refscale.c

@@ -63,6 +63,7 @@ do {											\
 
 #define SCALEOUT_ERRSTRING(s, x...) pr_alert("%s" SCALE_FLAG "!!! " s "\n", scale_type, ## x)
 
+MODULE_DESCRIPTION("Scalability test for object reference mechanisms");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Joel Fernandes (Google) <[email protected]>");