* move pool/pool_grad xpu kernel to phi, test=kunlun

* replace mutable_data() with DeviceContext::Alloc()

* replace PADDLE_ENFORCE_EQ with PADDLE_ENFORCE_XDNN, test=kunlun

* adjust function param name & update include header

* remove pool_op_xpu.cc

* fire r200 test

* minor, test=kunlun