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/hardware/video/bumblebee.nix

@@ -0,0 +1,93 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+let
+  cfg = config.hardware.bumblebee;
+
+  kernel = config.boot.kernelPackages;
+
+  useNvidia = cfg.driver == "nvidia";
+
+  bumblebee = pkgs.bumblebee.override {
+    inherit useNvidia;
+    useDisplayDevice = cfg.connectDisplay;
+  };
+
+  useBbswitch = cfg.pmMethod == "bbswitch" || cfg.pmMethod == "auto" && useNvidia;
+
+  primus = pkgs.primus.override {
+    inherit useNvidia;
+  };
+
+in
+
+{
+
+  options = {
+    hardware.bumblebee = {
+
+      enable = mkOption {
+        default = false;
+        type = types.bool;
+        description = ''
+          Enable the bumblebee daemon to manage Optimus hybrid video cards.
+          This should power off secondary GPU until its use is requested
+          by running an application with optirun.
+        '';
+      };
+
+      group = mkOption {
+        default = "wheel";
+        example = "video";
+        type = types.str;
+        description = "Group for bumblebee socket";
+      };
+
+      connectDisplay = mkOption {
+        default = false;
+        type = types.bool;
+        description = ''
+          Set to true if you intend to connect your discrete card to a
+          monitor. This option will set up your Nvidia card for EDID
+          discovery and to turn on the monitor signal.
+
+          Only nvidia driver is supported so far.
+        '';
+      };
+
+      driver = mkOption {
+        default = "nvidia";
+        type = types.enum [ "nvidia" "nouveau" ];
+        description = ''
+          Set driver used by bumblebeed. Supported are nouveau and nvidia.
+        '';
+      };
+
+      pmMethod = mkOption {
+        default = "auto";
+        type = types.enum [ "auto" "bbswitch" "switcheroo" "none" ];
+        description = ''
+          Set preferred power management method for unused card.
+        '';
+      };
+
+    };
+  };
+
+  config = mkIf cfg.enable {
+    boot.blacklistedKernelModules = [ "nvidia-drm" "nvidia" "nouveau" ];
+    boot.kernelModules = optional useBbswitch "bbswitch";
+    boot.extraModulePackages = optional useBbswitch kernel.bbswitch ++ optional useNvidia kernel.nvidia_x11.bin;
+
+    environment.systemPackages = [ bumblebee primus ];
+
+    systemd.services.bumblebeed = {
+      description = "Bumblebee Hybrid Graphics Switcher";
+      wantedBy = [ "multi-user.target" ];
+      before = [ "display-manager.service" ];
+      serviceConfig = {
+        ExecStart = "${bumblebee}/bin/bumblebeed --use-syslog -g ${cfg.group} --driver ${cfg.driver} --pm-method ${cfg.pmMethod}";
+      };
+    };
+  };
+}