Turn security.pam.services into an attribute set

That is, you can say

  security.pam.services.sshd = { options... };

instead of

  security.pam.services = [ { name = "sshd"; options... } ];

making it easier to override PAM settings from other modules.

nixos/modules/services/networking/ssh/lshd.nix

@@ -170,6 +170,8 @@ in
           '';
       };
 
+    security.pam.services.lshd = {};
+
   };
 
 }