meta-google: gbmc-bridge: Don't enable DHCPv6

Just turning DHCP off via the DHCP= option is not enough. If you use
IPv6AcceptRA=true you need to also disable the DHCPv6Client= in the
IPv6AcceptRA section.

Change-Id: I6e2e6e3f9b9395bd690f3d1a8915fac5061a0b25
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-google/networking/gbmc-bridge/-bmc-gbmcbr.network.in b/meta-google/recipes-google/networking/gbmc-bridge/-bmc-gbmcbr.network.in
index c6097bb..afea5cc 100644
--- a/meta-google/recipes-google/networking/gbmc-bridge/-bmc-gbmcbr.network.in
+++ b/meta-google/recipes-google/networking/gbmc-bridge/-bmc-gbmcbr.network.in
@@ -7,3 +7,5 @@
 LLMNR=true
 MulticastDNS=true
 LinkLocalAddressing=ipv6
+[IPv6AcceptRA]
+DHCPv6Client=false