ihk_os_getrusage(): Compile LWK-specific results in mcctrl

1. User asks mcctrl for the result via ihk_os_getrusage() with passing void *
2. mcctrl compiles the results and passes them to the user
3. User interprets it by using the type defined in the LWK-specific header

kernel/include/cls.h

@@ -93,6 +93,7 @@ struct cpu_local_var {
 	int timer_enabled;
 	int kmalloc_initialized;
 	struct ihk_os_cpu_monitor *monitor;
+	struct rusage_percpu *rusage;
 
 	ihk_spinlock_t smp_func_req_lock;
 	struct list_head smp_func_req_list;