sched: Move a few runnable tg variables into CONFIG_SMP

The following 2 variables are only used under CONFIG_SMP, so its
better to move their definiation into CONFIG_SMP too.

        atomic64_t load_avg;
        atomic_t runnable_avg;
Signed-off-by: Alex Shi <alex.shi@intel.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1371694737-29336-3-git-send-email-alex.shi@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

kernel/sched/sched.h

@@ -149,9 +149,11 @@ struct task_group {
 	unsigned long shares;
 
 	atomic_t load_weight;
+#ifdef	CONFIG_SMP
 	atomic64_t load_avg;
 	atomic_t runnable_avg;
 #endif
+#endif
 
 #ifdef CONFIG_RT_GROUP_SCHED
 	struct sched_rt_entity **rt_se;