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/hardware/network/smc-2632w/default.nix

@@ -0,0 +1,9 @@
+{lib, ...}:
+
+{
+  hardware = {
+    pcmcia = {
+      firmware = [ (lib.cleanSource ./firmware) ];
+    };
+  };
+}