[Script] Add route chan width option to vtr openfpga script

openfpga_flow/openfpga_shell_scripts/vtr_benchmark_example_script.openfpga

@@ -2,7 +2,7 @@
 # When the global clock is defined as a port of a tile, clock routing in VPR should be skipped
 # This is due to the Fc_in of clock port is set to 0 for global wiring
 #--write_rr_graph example_rr_graph.xml
-vpr ${VPR_ARCH_FILE} ${VPR_TESTBENCH_BLIF}
+vpr ${VPR_ARCH_FILE} ${VPR_TESTBENCH_BLIF} --route_chan_width ${VPR_ROUTE_CHAN_WIDTH}
 
 # Read OpenFPGA architecture definition
 read_openfpga_arch -f ${OPENFPGA_ARCH_FILE}