* [XPU]add split op for kunlun2,*test=kunlun

* [XPU]add split op for kunlun2,*test=kunlun

* [XPU]add split op for kunlun,*test=kunlun

* [XPU]add stack_grad op for kunlun2,*test=kunlun
Co-authored-by: NQingshuChen <chenqingshu@baidu.com>