bridge: mrp: Set the priority of MRP instance

Each MRP instance has a priority, a lower value means a higher priority.
The priority of MRP instance is stored in MRP_Test frame in this way
all the MRP nodes in the ring can see other nodes priority.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/switchdev.h

@@ -116,6 +116,7 @@ struct switchdev_obj_mrp {
 	struct net_device *p_port;
 	struct net_device *s_port;
 	u32 ring_id;
+	u16 prio;
 };
 
 #define SWITCHDEV_OBJ_MRP(OBJ) \