sched/rt: Fix compile errors when WALT is disabled

Change-Id: If25bddeb70670d0fcaf93088ebf55ab3dc80b4e3
Signed-off-by: Danny Lin <danny@kdrag0n.dev>
Signed-off-by: Alexander Winkowski <dereference23@outlook.com>

kernel/sched/rt.c

@@ -1759,9 +1759,13 @@ static int rt_energy_aware_wake_cpu(struct task_struct *task)
 	unsigned long tutil = task_util(task);
 	int best_cpu_idle_idx = INT_MAX;
 	int cpu_idle_idx = -1, start_cpu;
+#ifdef CONFIG_SCHED_WALT
 	bool boost_on_big = sched_boost() == FULL_THROTTLE_BOOST ?
 				  (sched_boost_policy() == SCHED_BOOST_ON_BIG) :
 				  false;
+#else
+	bool boost_on_big = false;
+#endif
 
 	rcu_read_lock();