Add sched_wakeup_task() in mo_sem_signal()

Previously, mo_sem_signal() only changed the awakened task state
to TASK_READY when a semaphore signal was triggered. In the new
scheduler design, which selects runnable tasks from ready queues,
the awakened task must also be enqueued for scheduling.

This change invokes sched_wakeup_task() to perform the enqueue
operation, ensuring the awakened task is properly inserted into
the ready queue.

Author: vicLin8712

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 */