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/ipv6-config.section.md

@@ -0,0 +1,42 @@
+# IPv6 Configuration {#sec-ipv6}
+
+IPv6 is enabled by default. Stateless address autoconfiguration is used
+to automatically assign IPv6 addresses to all interfaces, and Privacy
+Extensions (RFC 4946) are enabled by default. You can adjust the default
+for this by setting [](#opt-networking.tempAddresses). This option
+may be overridden on a per-interface basis by
+[](#opt-networking.interfaces._name_.tempAddress). You can disable
+IPv6 support globally by setting:
+
+```nix
+networking.enableIPv6 = false;
+```
+
+You can disable IPv6 on a single interface using a normal sysctl (in
+this example, we use interface `eth0`):
+
+```nix
+boot.kernel.sysctl."net.ipv6.conf.eth0.disable_ipv6" = true;
+```
+
+As with IPv4 networking interfaces are automatically configured via
+DHCPv6. You can configure an interface manually:
+
+```nix
+networking.interfaces.eth0.ipv6.addresses = [ {
+  address = "fe00:aa:bb:cc::2";
+  prefixLength = 64;
+} ];
+```
+
+For configuring a gateway, optionally with explicitly specified
+interface:
+
+```nix
+networking.defaultGateway6 = {
+  address = "fe00::1";
+  interface = "enp0s3";
+};
+```
+
+See [](#sec-ipv4) for similar examples and additional information.