[XPU] add load op into oplist. (#48860)

* [XPU] add load op into oplist. * remove test_sampling_id_op_xpu.py

Author: houj04

paddle/phi/backends/xpu/xpu2_op_list.cc

@@ -300,6 +300,7 @@ XPUOpMap& get_kl2_ops() {
  XPUKernelSet({phi::DataType::INT64,
  phi::DataType::INT32,
  phi::DataType::FLOAT32})},
+ {"load", XPUKernelSet({phi::DataType::FLOAT32})},
  {"load_combine",
  XPUKernelSet({phi::DataType::FLOAT32,
  phi::DataType::FLOAT64,