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/common/user-account.nix

@@ -0,0 +1,15 @@
+{ ... }:
+
+{ users.users.alice =
+    { isNormalUser = true;
+      description = "Alice Foobar";
+      password = "foobar";
+      uid = 1000;
+    };
+
+  users.users.bob =
+    { isNormalUser = true;
+      description = "Bob Foobar";
+      password = "foobar";
+    };
+}