change to async mode for xpu multi-card training in static graph mode

[XiaociZhang]

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change to async mode for xpu multi-card training in static graph mode

[paddle-bot[bot]]

你的PR提交成功，感谢你对开源项目的贡献! 请关注后续CI自动化测试结果，详情请参考Paddle-CI手册。 Your PR has been submitted. Thanks for your contribution! Please wait for the result of CI firstly. See Paddle CI Manual for details.

[paddle-bot[bot]]

你的PR已合入Paddle库，请关注后续测试结果。 Your PR has been merged into the repository. An official integration test will be conducted later. Stay tuned.