switchdev: mrp: Remove the variable mrp_ring_state

Remove the variable mrp_ring_state from switchdev_attr because is not
used anywhere.
The ring state is set using SWITCHDEV_OBJ_ID_RING_STATE_MRP.

Fixes: c284b545 ("switchdev: mrp: Extend switchdev API to offload MRP")
Acked-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/switchdev.h

@@ -62,7 +62,6 @@ struct switchdev_attr {
 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
 		u8 mrp_port_state;			/* MRP_PORT_STATE */
 		u8 mrp_port_role;			/* MRP_PORT_ROLE */
-		u8 mrp_ring_state;			/* MRP_RING_STATE */
 #endif
 	} u;
 };