Speed up rockpi startup

ipv6 was taking ages to time out.  Don't bother...

Change-Id: Ib91e82888652d2a81f4466d0d1d6724c0f1061d4
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/frc971/rockpi/contents/etc/systemd/network/eth0.network b/frc971/rockpi/contents/etc/systemd/network/eth0.network
index f9e7c2e..8bfaf61 100644
--- a/frc971/rockpi/contents/etc/systemd/network/eth0.network
+++ b/frc971/rockpi/contents/etc/systemd/network/eth0.network
@@ -5,3 +5,7 @@
 Address=10.9.71.20/24
 Gateway=10.9.71.13
 DNS=8.8.8.8
+
+# ipv6 adds an extra 10 seconds to boot, and we don't use it...
+# Disable all the route discovery and stuff
+LinkLocalAddressing=no