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>

pkgs/os-specific/linux/usbrelay/test.nix

@@ -0,0 +1,63 @@
+# NixOS test for usbrelayd
+#
+# It is not stored in nixos/tests directory, because it requires the
+# USB relay connected to the host computer and as such, it cannot be
+# run automatically.
+#
+# Run this test as:
+#
+#     nix-build test.nix -A driverInteractive && ./result/bin/nixos-test-driver --no-interactive
+#
+# The interactive driver is required because the default
+# (non-interactive) driver uses qemu without support for passing USB
+# devices to the guest (see
+# https://discourse.nixos.org/t/hardware-dependent-nixos-tests/18564
+# for discussion of other alternatives).
+
+import ../../../../nixos/tests/make-test-python.nix ({ pkgs, ... }: {
+  name = "usbrelayd";
+
+  nodes.machine = {
+    virtualisation.qemu.options = [
+      "-device qemu-xhci"
+      "-device usb-host,vendorid=0x16c0,productid=0x05df"
+    ];
+    services.usbrelayd.enable = true;
+    systemd.services.usbrelayd = {
+      after = [ "mosquitto.service" ];
+    };
+    services.mosquitto = {
+      enable = true;
+      listeners = [{
+        acl = [ "pattern readwrite #" ];
+        omitPasswordAuth = true;
+        settings.allow_anonymous = true;
+      }];
+    };
+    environment.systemPackages = [
+      pkgs.usbrelay
+      pkgs.mosquitto
+    ];
+    documentation.nixos.enable = false; # building nixos manual takes long time
+  };
+
+  testScript = ''
+    if os.waitstatus_to_exitcode(os.system("lsusb -d 16c0:05df")) != 0:
+        print("No USB relay detected, skipping test")
+        import sys
+        sys.exit(2)
+    machine.start()
+    # usbrelayd is started by udev when an relay is detected
+    machine.wait_for_unit("usbrelayd.service")
+
+    stdout = machine.succeed("usbrelay")
+    relay_id = stdout.split(sep="_")[0]
+    assert relay_id != ""
+    import time
+    time.sleep(1)
+    machine.succeed(f"mosquitto_pub -h localhost -t cmnd/{relay_id}/1 -m ON")
+    time.sleep(1)
+    machine.succeed(f"mosquitto_pub -h localhost -t cmnd/{relay_id}/1 -m OFF")
+    print("Did you see the relay switching on and off?")
+  '';
+})