treewide: use mkPackageOption

This commit replaces a lot of usages of `mkOption` with the package
type, to be `mkPackageOption`, in order to reduce the amount of code.

nixos/modules/services/logging/syslog-ng.nix

@@ -40,14 +40,7 @@ in {
           Whether to enable the syslog-ng daemon.
         '';
       };
-      package = mkOption {
-        type = types.package;
-        default = pkgs.syslogng;
-        defaultText = literalExpression "pkgs.syslogng";
-        description = lib.mdDoc ''
-          The package providing syslog-ng binaries.
-        '';
-      };
+      package = mkPackageOption pkgs "syslogng" { };
       extraModulePaths = mkOption {
         type = types.listOf types.str;
         default = [];