添加片内硬件rtc

rt-thread/components/drivers/rtc/rtc.c

@@ -127,10 +127,10 @@ rt_err_t rt_hw_rtc_register(rt_rtc_dev_t  *rtc,
     device->read        = RT_NULL;
     device->write       = RT_NULL;
     device->control     = rt_rtc_control;
-#endif /* RT_USING_DEVICE_OPS */
+#endif // RT_USING_DEVICE_OPS
     device->user_data   = data;
 
-    /* register a character device */
+    // register a character device
     return rt_device_register(device, name, flag);
 }