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/profiles/demo.nix

@@ -0,0 +1,21 @@
+{ ... }:
+
+{
+  imports = [ ./graphical.nix ];
+
+  users.users.demo =
+    { isNormalUser = true;
+      description = "Demo user account";
+      extraGroups = [ "wheel" ];
+      password = "demo";
+      uid = 1000;
+    };
+
+  services.xserver.displayManager = {
+    autoLogin = {
+      enable = true;
+      user = "demo";
+    };
+    sddm.autoLogin.relogin = true;
+  };
+}