* add xpu buffer_reader, *test=kunlun

* xpu buffer_reader, use XPUDeviceGuard, *test=kunlun

* modify xpu.cmake, *test=kunlun

* modify xpu.cmake, *test=kunlun

* modify xpu.cmake, *test=kunlun

* add xpu buffer_reader, *test=kunlun

* add xpu buffer reader, *test=kunlun

* add xpu buffer reader, *test=kunlun

* rename pten to phi

* fix infrt compile failed

* resolve conflict

* update cmake file to remove fluid kernel

* add pten declaration.h to where pybind.h used

* fix sync_bn and tensorrt_engine

* refine detection_library

* fix interpreter_core

* support eager legacy

* fit eager legacy for pten

* fall back to cpu if not found kernel

* fix compile problem

* fix compile problem

* refine fallback logic

* fit operator.run()

* fix xpu compile

* fit for new_exec

* add REGISTER_OP_WITHOUT_GRADIENT

* un-cache pt_kernel_context

* fix compile

* fix cudnn

* fix compiling with on_infer

* fix mkldnn

* fix isfinite_v2

* fix xpu problem

* fix op_device

* refine fallback for xpu

* fix xpu compile

* merge develop

* refine code format

* fix compile

* fix compile

* add data_transfer

* fix PreparePtenData

* fix cpu context

* merge develop

* fix compile

* fix error device context

* fix xpu

* fix dev_ctx

* [XPU] Reorganize xpu device codes in platform, test=develop

* fix xpu_header.h, test=develop