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/doc/manual/configuration/ad-hoc-network-config.section.md

@@ -0,0 +1,13 @@
+# Ad-Hoc Configuration {#ad-hoc-network-config}
+
+You can use [](#opt-networking.localCommands) to
+specify shell commands to be run at the end of `network-setup.service`. This
+is useful for doing network configuration not covered by the existing NixOS
+modules. For instance, to statically configure an IPv6 address:
+
+```nix
+networking.localCommands =
+  ''
+    ip -6 addr add 2001:610:685:1::1/64 dev eth0
+  '';
+```