Merge pull request #2855 from verilog-to-routing/rrgraph_switch_warning

convert switch id check with architecture to warning instead of error

Author: vaughnbetz

libs/librrgraph/src/io/rr_graph_uxsdcxx_serializer.h

@@ -534,7 +534,7 @@ class RrGraphSerializer final : public uxsd::RrGraphBase<RrGraphContextTypes> {
             }
         }
         if (!found_arch_name) {
-            report_error("Switch name '%s' not found in architecture\n", string_name.c_str());
+            VTR_LOG("Switch name '%s' found in RR graph input from file but not in the architecture file; creating it.\n", string_name.c_str());
         }
         sw->intra_tile = is_internal_sw;
         sw->name = string_name;