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/tests/kernel-generic.nix

@@ -0,0 +1,42 @@
+{ system ? builtins.currentSystem
+, config ? { }
+, pkgs ? import ../.. { inherit system config; }
+}@args:
+
+with pkgs.lib;
+
+let
+  testsForLinuxPackages = linuxPackages: (import ./make-test-python.nix ({ pkgs, ... }: {
+    name = "kernel-${linuxPackages.kernel.version}";
+    meta = with pkgs.lib.maintainers; {
+      maintainers = [ nequissimus atemu ];
+    };
+
+    nodes.machine = { ... }:
+      {
+        boot.kernelPackages = linuxPackages;
+      };
+
+    testScript =
+      ''
+        assert "Linux" in machine.succeed("uname -s")
+        assert "${linuxPackages.kernel.modDirVersion}" in machine.succeed("uname -a")
+      '';
+  }) args);
+  kernels = pkgs.linuxKernel.vanillaPackages // {
+    inherit (pkgs.linuxKernel.packages)
+      linux_4_14_hardened
+      linux_4_19_hardened
+      linux_5_4_hardened
+      linux_5_10_hardened
+      linux_5_15_hardened
+      linux_5_17_hardened
+
+      linux_testing;
+  };
+
+in mapAttrs (_: lP: testsForLinuxPackages lP) kernels // {
+  inherit testsForLinuxPackages;
+
+  testsForKernel = kernel: testsForLinuxPackages (pkgs.linuxPackagesFor kernel);
+}