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/hardware/trezord.nix

@@ -0,0 +1,70 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+let
+  cfg = config.services.trezord;
+in {
+
+  ### docs
+
+  meta = {
+    doc = ./trezord.xml;
+  };
+
+  ### interface
+
+  options = {
+    services.trezord = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Enable Trezor bridge daemon, for use with Trezor hardware bitcoin wallets.
+        '';
+      };
+
+      emulator.enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Enable Trezor emulator support.
+          '';
+       };
+
+      emulator.port = mkOption {
+        type = types.port;
+        default = 21324;
+        description = ''
+          Listening port for the Trezor emulator.
+          '';
+      };
+    };
+  };
+
+  ### implementation
+
+  config = mkIf cfg.enable {
+    services.udev.packages = [ pkgs.trezor-udev-rules ];
+
+    systemd.services.trezord = {
+      description = "Trezor Bridge";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      path = [];
+      serviceConfig = {
+        Type = "simple";
+        ExecStart = "${pkgs.trezord}/bin/trezord-go ${optionalString cfg.emulator.enable "-e ${builtins.toString cfg.emulator.port}"}";
+        User = "trezord";
+      };
+    };
+
+    users.users.trezord = {
+      group = "trezord";
+      description = "Trezor bridge daemon user";
+      isSystemUser = true;
+    };
+
+    users.groups.trezord = {};
+  };
+}
+