PaddleOCR 2.7 适配NPU+CANN7.0的需求

[chaoqunx]

请提供下述完整信息以便快速定位问题/Please provide the following information to quickly locate the problem

• 系统环境/System Environment：ubuntu20.04 + python3.7 + paddle2.4 + Ascend910 + CANN7.0
• 版本号/Version：Paddle： PaddleOCR： 问题相关组件/Related components：Paddle2.4+paddleOCR2.7,
• 运行指令/Command Code：python3 -m paddle.distributed.launch --gpus '0,1,2,3' tools/train.py -c configs/det/det_mv3_db.yml
  -o Global.pretrained_model=./pretrain_models/MobileNetV3_large_x0_5_pretrained
• 完整报错/Complete Error Message：
  不能选择GPU，会提示找不到device

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请尽量不要包含图片在问题中/Please try to not include the image in the issue.