Add support for cpuif that have write strobes

src/peakrdl_regblock/cpuif/apb3/apb3_tmpl.sv

@@ -28,6 +28,7 @@ always_ff {{get_always_ff_event(cpuif.reset)}} begin
         end
     end
 end
+assign cpuif_wr_biten = '1;
 
 // Response
 assign {{cpuif.signal("pready")}} = cpuif_rd_ack | cpuif_wr_ack;