net: marvell: prestera: devlink: add traps/groups implementation

Add devlink traps registration (with corresponding groups) for
all the traffic types that driver traps to the CPU;
prestera_rxtx: report each packet trapped to the CPU (RX) to the
prestera_devlink;

Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/prestera/prestera.h

@@ -170,13 +170,15 @@ struct prestera_event {
 
 struct prestera_switchdev;
 struct prestera_rxtx;
+struct prestera_trap_data;
 
 struct prestera_switch {
 	struct prestera_device *dev;
 	struct prestera_switchdev *swdev;
 	struct prestera_rxtx *rxtx;
 	struct list_head event_handlers;
 	struct notifier_block netdev_nb;
+	struct prestera_trap_data *trap_data;
 	char base_mac[ETH_ALEN];
 	struct list_head port_list;
 	rwlock_t port_list_lock;