net: dsa: bcm_sf2: Add support for port mirroring

We can use b53_mirror_add and b53_mirror_del because the Starfighter 2
is register compatible in that specific case.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/bcm_sf2.c

@@ -1047,6 +1047,8 @@ static const struct dsa_switch_ops bcm_sf2_ops = {
 	.port_fdb_del		= b53_fdb_del,
 	.get_rxnfc		= bcm_sf2_get_rxnfc,
 	.set_rxnfc		= bcm_sf2_set_rxnfc,
+	.port_mirror_add	= b53_mirror_add,
+	.port_mirror_del	= b53_mirror_del,
 };
 
 struct bcm_sf2_of_data {