net: introduce lower state changed info structure for LAG lowers

This is shared info structure for bonding and team. Serves to pass down
info about link state and port activity to notification listeners.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -2123,6 +2123,11 @@ struct netdev_lag_upper_info {
 	enum netdev_lag_tx_type tx_type;
 };
 
+struct netdev_lag_lower_state_info {
+	u8 link_up : 1,
+	   tx_enabled : 1;
+};
+
 #include <linux/notifier.h>
 
 /* netdevice notifier chain. Please remember to update the rtnetlink