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/top-level/release-r.nix

@@ -0,0 +1,13 @@
+/*
+  This is the Hydra jobset for the `r-updates` branch in Nixpkgs.
+  The jobset can be tested by:
+
+  $ hydra-eval-jobs -I . pkgs/top-level/release-r.nix
+*/
+{ supportedSystems ? [ "x86_64-linux" "aarch64-linux" ] }:
+
+with import ./release-lib.nix { inherit supportedSystems; };
+
+mapTestOn {
+  rPackages = packagePlatforms pkgs.rPackages;
+}