gbmc-bridge: Add missing nftables dependency

We have scripts modifying nftables rules, but we don't have nftables
guaranteed to be installed.

Change-Id: Ib859435de8a12b4c54572fbf816578898714d487
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-google/networking/gbmc-bridge.bb b/meta-google/recipes-google/networking/gbmc-bridge.bb
index 494fbef..8b9cdb5 100644
--- a/meta-google/recipes-google/networking/gbmc-bridge.bb
+++ b/meta-google/recipes-google/networking/gbmc-bridge.bb
@@ -46,6 +46,7 @@
   mstpd-mstpd \
   network-sh \
   ndisc6-rdisc6 \
+  nftables-systemd \
   "
 
 SYSTEMD_SERVICE:${PN} += " \