lib.getOpenwrtModel: update to newer model naming scheme

nix/lib/default.nix

@@ -15,8 +15,9 @@ rec {
     let
       models =
         builtins.filter ({ models, ... }:
-          self.lib.any ({ model, ... }:
-            model == wantedModel
+          self.lib.any ({ model, vendor, ... }:
+            model == wantedModel ||
+            "${vendor}_${model}" == wantedModel
           ) models
         ) openwrtModels;
       result =