【PIR OpTest Fix No.4】 fix test_sgd_op_bf16

[xingmingyyj]

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Description

PIR Op单测修复
修复单测 test_sgd_op_bf16
修复后打开FLAGS_enable_pir_in_executor单测是否通过：修复中
报错信息：.......
遇到的问题：
单测test_sgd_op_bf16.TestSGDOpBF16和test_sgd_op_bf16.TestSGDOpBF16Case2中

新旧IR下执行sgd精度误差过大：

原因分析：
造成精度误差过大的原因是因为新旧IR下Kernel选择不一致造成的

• 旧IR下选择的Kernel
  
• 新IR下选择的Kernel
  

由旧IR输出日志及下面的代码来看，旧IR下如果PADDLE_WITH_DNNL有效，会将数据排布格式由NCHW转化为ONEDNN类型，并且选择对应的Kernel

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