meta-google: gbmc-bridge: Add package

This adds a machine local ethernet network which allows BMCs to
communicate with one another.

Change-Id: I5e0ace231af02d84f7678b8241b5ec71823e86af
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-connectivity/avahi/files/avahi-daemon.conf b/meta-google/recipes-connectivity/avahi/files/avahi-daemon.conf
index 9688ffb..57520df 100644
--- a/meta-google/recipes-connectivity/avahi/files/avahi-daemon.conf
+++ b/meta-google/recipes-connectivity/avahi/files/avahi-daemon.conf
@@ -1,5 +1,5 @@
 [server]
-allow-interfaces=mgmt
+allow-interfaces=mgmt,gbmcbr
 
 [publish]
 disable-user-service-publishing=yes