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/hologram-agent.nix

@@ -0,0 +1,58 @@
+{pkgs, config, lib, ...}:
+
+with lib;
+
+let
+  cfg = config.services.hologram-agent;
+
+  cfgFile = pkgs.writeText "hologram-agent.json" (builtins.toJSON {
+    host = cfg.dialAddress;
+  });
+in {
+  options = {
+    services.hologram-agent = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Whether to enable the Hologram agent for AWS instance credentials";
+      };
+
+      dialAddress = mkOption {
+        type        = types.str;
+        default     = "localhost:3100";
+        description = "Hologram server and port.";
+      };
+
+      httpPort = mkOption {
+        type        = types.str;
+        default     = "80";
+        description = "Port for metadata service to listen on.";
+      };
+
+    };
+  };
+
+  config = mkIf cfg.enable {
+    boot.kernelModules = [ "dummy" ];
+
+    networking.interfaces.dummy0.ipv4.addresses = [
+      { address = "169.254.169.254"; prefixLength = 32; }
+    ];
+
+    systemd.services.hologram-agent = {
+      description = "Provide EC2 instance credentials to machines outside of EC2";
+      after       = [ "network.target" ];
+      wantedBy    = [ "multi-user.target" ];
+      requires    = [ "network-link-dummy0.service" "network-addresses-dummy0.service" ];
+      preStart = ''
+        /run/current-system/sw/bin/rm -fv /run/hologram.sock
+      '';
+      serviceConfig = {
+        ExecStart = "${pkgs.hologram}/bin/hologram-agent -debug -conf ${cfgFile} -port ${cfg.httpPort}";
+      };
+    };
+
+  };
+
+  meta.maintainers = with lib.maintainers; [ ];
+}