Revert "nixos/udev: fix outdated udev rules for network devices"

This reverts commit 45c5a915980fbe1fa6f0ff80ab2d11b60b844d9e.

This breaks PredictableNetworkInterfaceNames on systems without networkd.
We should only include this file from systemd, when networkd is enabled.

nixos/modules/services/hardware/80-net-setup-link.rules

···
+# Copied from systemd 203.
+ACTION=="remove", GOTO="net_name_slot_end"
+SUBSYSTEM!="net", GOTO="net_name_slot_end"
+NAME!="", GOTO="net_name_slot_end"
+
+IMPORT{cmdline}="net.ifnames"
+ENV{net.ifnames}=="0", GOTO="net_name_slot_end"
+
+NAME=="", ENV{ID_NET_NAME_ONBOARD}!="", NAME="$env{ID_NET_NAME_ONBOARD}"
+NAME=="", ENV{ID_NET_NAME_SLOT}!="", NAME="$env{ID_NET_NAME_SLOT}"
+NAME=="", ENV{ID_NET_NAME_PATH}!="", NAME="$env{ID_NET_NAME_PATH}"
+
+LABEL="net_name_slot_end"

nixos/modules/services/hardware/udev.nix

···
       fi
 
       ${optionalString config.networking.usePredictableInterfaceNames ''
-        cp ${udev}/lib/udev/rules.d/80-net-setup-link.rules $out/80-net-setup-link.rules
+        cp ${./80-net-setup-link.rules} $out/80-net-setup-link.rules
       ''}
 
       # If auto-configuration is disabled, then remove