make selected_row not depends on fluid (#44835)

paddle/phi/core/CMakeLists.txt

@@ -65,7 +65,7 @@ cc_library(
 cc_library(
   selected_rows
   SRCS selected_rows_impl.cc selected_rows.cc
-  DEPS tensor_base dense_tensor phi_enforce ddim memcpy)
+  DEPS tensor_base dense_tensor phi_enforce ddim)
 cc_library(
   phi_device_context
   SRCS device_context.cc

paddle/phi/core/selected_rows_impl.cc

@@ -58,9 +58,7 @@ struct TensorCopyVisitor {
   void apply() const {
     // TODO(Yancey1989): support other place
     phi::CPUPlace cpu;
-    paddle::memory::Copy(cpu,
-                         dst_->mutable_data<T>(cpu) + dst_offset_,
-                         cpu,
+    std::memcpy(dst_->mutable_data<T>(cpu) + dst_offset_,
                 src_.data<T>() + src_offset_,
                 size_ * sizeof(T));
   }