added missing declaration

Signed-off-by: Byoungro So <byoungro.so@intel.com>

sycl/include/sycl/device.hpp

@@ -349,6 +349,10 @@ class __SYCL_EXPORT device : public detail::OwnerLessBase<device> {
   typename detail::is_device_info_desc<Param>::return_type
   get_info_impl() const;
 
+  template <typename Param>
+  std::ReturnType<typename detail::is_device_info_desc<Param>::return_type>
+  get_info_internal() const;
+
   // proxy of get_info_internal() to handle C++11-ABI compatibility separately.
   template <typename Param>
   detail::string get_device_info() const;