net: dsa: mv88e6xxx: rework FDB add/del operations

Add a low level function for the ATU Load operation, and provide FDB add
and delete wrappers functions.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/dsa/mv88e6352.c b/drivers/net/dsa/mv88e6352.c
index 0a77135..191fb25 100644
--- a/drivers/net/dsa/mv88e6352.c
+++ b/drivers/net/dsa/mv88e6352.c
@@ -341,6 +341,8 @@
 	.port_join_bridge	= mv88e6xxx_join_bridge,
 	.port_leave_bridge	= mv88e6xxx_leave_bridge,
 	.port_stp_update	= mv88e6xxx_port_stp_update,
+	.port_fdb_add		= mv88e6xxx_port_fdb_add,
+	.port_fdb_del		= mv88e6xxx_port_fdb_del,
 	.port_fdb_getnext	= mv88e6xxx_port_fdb_getnext,
 };