[BSP]BM9BF618S:Fix timer initialization issue

bsp/mb9bf618s/applications/startup.c

@@ -59,6 +59,7 @@ void rtthread_startup(void)
     rt_system_scheduler_init();
 
     /* init timer thread */
+	  rt_system_timer_init();
     rt_system_timer_thread_init();
 
     /* init application */