Enable networking and console over the USB port

That one is much more friendly than the UART0 pin header.

Change-Id: I76affd2803eb2f18911eb71cbdfc1ffd6bf4fd76
diff --git a/board/czechlight/common/overlay/etc/systemd/network/30-usbnet-apipa.network b/board/czechlight/common/overlay/etc/systemd/network/30-usbnet-apipa.network
new file mode 100644
index 0000000..807dcc4
--- /dev/null
+++ b/board/czechlight/common/overlay/etc/systemd/network/30-usbnet-apipa.network
@@ -0,0 +1,6 @@
+[Match]
+Name=usb0
+
+[Network]
+Description=miniUSB console
+LinkLocalAddressing=yes