Add DBus property for updating the IPv6 Router Advertisement

Allow the IPv6AcceptRA boolean in the 00-bmc-ethx.network file read by
systemd to be written.

Change-Id: I1cc925c64ad456074a68ae984a5fac8b8e7e888a
Signed-off-by: Johnathan Mantey <johnathanx.mantey@intel.com>
diff --git a/xyz/openbmc_project/Network/EthernetInterface.interface.yaml b/xyz/openbmc_project/Network/EthernetInterface.interface.yaml
index 744ac77..6fa1d0b 100644
--- a/xyz/openbmc_project/Network/EthernetInterface.interface.yaml
+++ b/xyz/openbmc_project/Network/EthernetInterface.interface.yaml
@@ -42,6 +42,10 @@
       description: >
           This indicates link local auto configuration on this ethernet
           interface and configured on this ethernet interface.
+    - name: IPv6AcceptRA
+      type: boolean
+      description: >
+          Boolean for accepting router advertisements in IPv6
 
 enumerations:
     - name: LinkLocalConf