bridge: netlink: add support for multicast_querier

Add IFLA_BR_MCAST_QUERIER to allow setting/getting br->multicast_querier
via netlink.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 7090b39..fe5fac5 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -248,6 +248,7 @@
 	IFLA_BR_MCAST_ROUTER,
 	IFLA_BR_MCAST_SNOOPING,
 	IFLA_BR_MCAST_QUERY_USE_IFADDR,
+	IFLA_BR_MCAST_QUERIER,
 	__IFLA_BR_MAX,
 };