Fix gpu module building with cuda 13.2 (#6424)

* Fix gpu module building with cuda 13.2

* simplify

---------

Co-authored-by: jmackay2 <jmackay2>

Author: jmackay2

gpu/utils/include/pcl/gpu/utils/device/functional.hpp

@@ -41,6 +41,10 @@
 #include <thrust/functional.h>
 #include <cuda.h>
 
+#if CUDA_VERSION >= 13000
+#include <cuda/std/functional>
+#endif
+
 namespace pcl
 {
     namespace device
@@ -84,7 +88,6 @@ namespace pcl
         };
 
         // Generalized Identity Operations
-
         #if CUDA_VERSION >= 13000
         using cuda::std::identity;
         #else