restore device helper

src/common/device_helpers.cuh

@@ -2,9 +2,6 @@
  * Copyright 2017-2023 XGBoost contributors
  */
 #pragma once
-
-#if defined(XGBOOST_USE_CUDA)
-
 #include <thrust/binary_search.h>  // thrust::upper_bound
 #include <thrust/device_malloc_allocator.h>
 #include <thrust/device_ptr.h>
@@ -1385,7 +1382,3 @@ class LDGIterator {
   }
 };
 }  // namespace dh
-
-#elif defined(XGBOOST_USE_HIP)
-#include "device_helpers.hip.h"
-#endif