uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

nixos/modules/services/security/fprintd.nix

@@ -0,0 +1,64 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.fprintd;
+  fprintdPkg = if cfg.tod.enable then pkgs.fprintd-tod else pkgs.fprintd;
+
+in
+
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.fprintd = {
+
+      enable = mkEnableOption "fprintd daemon and PAM module for fingerprint readers handling";
+
+      package = mkOption {
+        type = types.package;
+        default = fprintdPkg;
+        defaultText = literalExpression "if config.services.fprintd.tod.enable then pkgs.fprintd-tod else pkgs.fprintd";
+        description = ''
+          fprintd package to use.
+        '';
+      };
+
+      tod = {
+
+        enable = mkEnableOption "Touch OEM Drivers library support";
+
+        driver = mkOption {
+          type = types.package;
+          example = literalExpression "pkgs.libfprint-2-tod1-goodix";
+          description = ''
+            Touch OEM Drivers (TOD) package to use.
+          '';
+        };
+      };
+    };
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    services.dbus.packages = [ cfg.package ];
+
+    environment.systemPackages = [ cfg.package ];
+
+    systemd.packages = [ cfg.package ];
+
+    systemd.services.fprintd.environment = mkIf cfg.tod.enable {
+      FP_TOD_DRIVERS_DIR = "${cfg.tod.driver}${cfg.tod.driver.driverPath}";
+    };
+
+  };
+
+}