aispeech: add wait_device_mode_timeout_ms when vad resume

Change-Id: Id4f1e711541a49879347118bcc7852c071213656
Signed-off-by: Nyx Zheng <zyh@rock-chips.com>

rk3308/aispeech/dds_client/demo/main.c

@@ -401,6 +401,7 @@ void *vad_detect_func(void* arg) {
             do_system_sleep();
             printf("resume >>>>\n");
             dds_client_publish(dc, DDS_CLIENT_USER_DEVICE_MODE, "{\"mode\":\"normal\"}");
+            wait_device_mode_timeout_ms(30);
         }
         usleep(1000*1000);
     }