edf: using specific schedule_edf() instead of schedule()

I've changed scheduler invocation in schedule_edf_task_normal()
from generic schedule() to specific schedule_edf() for optimization
(there is no need to use generic functions in specific scheduler
implementation).

Signed-off-by: Bartosz Kokoszko <bartoszx.kokoszko@linux.intel.com>

src/lib/edf_schedule.c

@@ -346,7 +346,7 @@ static void schedule_edf_task_normal(struct task *task, uint64_t start,
 	/* need to run scheduler if task not already running */
 	if (need_sched) {
 		/* rerun scheduler */
-		schedule();
+		schedule_edf();
 	}
 }