Add enqueuing path in mo_mutex_signal()

This commit adds enqueuing path for awakened task when
mo_mutex_signal() is called; the mo_wake_up() API adds
in header file for enqueuing operation.

Author: vicLin8712

include/sys/task.h

@@ -303,3 +303,6 @@ void _sched_block(queue_t *wait_q);
  * Returns 'true' to enable preemptive scheduling, or 'false' for cooperative
  */
 int32_t app_main(void);
+
+/* Wake up and enqueue task into ready queue */
+void sched_wakeup_task(tcb_t *);

kernel/semaphore.c

@@ -176,7 +176,7 @@ void mo_sem_signal(sem_t *s)
         if (likely(awakened_task)) {
             /* Validate awakened task state consistency */
             if (likely(awakened_task->state == TASK_BLOCKED)) {
-                awakened_task->state = TASK_READY;
+                sched_wakeup_task(awakened_task);
                 should_yield = true;
             } else {
                 /* Task state inconsistency - this should not happen */