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/installer/scan/detected.nix

@@ -0,0 +1,12 @@
+# List all devices which are detected by nixos-generate-config.
+# Common devices are enabled by default.
+{ lib, ... }:
+
+with lib;
+
+{
+  config = mkDefault {
+    # Common firmware, i.e. for wifi cards
+    hardware.enableRedistributableFirmware = true;
+  };
+}

nixos/modules/installer/scan/not-detected.nix

@@ -0,0 +1,6 @@
+# Enables non-free firmware on devices not recognized by `nixos-generate-config`.
+{ lib, ... }:
+
+{
+  hardware.enableRedistributableFirmware = lib.mkDefault true;
+}