[DeviceDriver] Add more exported symbols for completion.

components/drivers/src/completion.c

@@ -39,6 +39,7 @@ void rt_completion_init(struct rt_completion *completion)
     rt_list_init(&completion->suspended_list);
     rt_hw_interrupt_enable(level);
 }
+RTM_EXPORT(rt_completion_init);
 
 rt_err_t rt_completion_wait(struct rt_completion *completion,
                             rt_int32_t            timeout)
@@ -105,6 +106,7 @@ __exit:
 
     return result;
 }
+RTM_EXPORT(rt_completion_wait);
 
 void rt_completion_done(struct rt_completion *completion)
 {
@@ -139,3 +141,5 @@ void rt_completion_done(struct rt_completion *completion)
         rt_hw_interrupt_enable(level);
     }
 }
+RTM_EXPORT(rt_completion_done);
+