Update SetupGrid.h

Author: Wang-Yuanqi-source

vpr/src/base/SetupGrid.h

@@ -21,7 +21,7 @@ DeviceGrid create_device_grid(const std::string& layout_name,
 
 ///@brief Find the device close in size to the specified dimensions
 
-DeviceGrid create_device_grid(std::string& layout_name, const std::vector<t_grid_def>& grid_layouts, size_t min_width, size_t min_height);
+DeviceGrid create_device_grid(const std::string& layout_name, const std::vector<t_grid_def>& grid_layouts, size_t min_width, size_t min_height);
 vtr::NdMatrix<const t_vib_inf*, 3> create_vib_device_grid(std::string layout_name, const std::vector<t_vib_grid_def>& vib_grid_layouts);
 
 /**