net: dsa: store CPU port pointer in the tree

A dsa_switch_tree instance holds a dsa_switch pointer and a port index
to identify the switch port to which the CPU is attached.

Now that the DSA layer has a dsa_port structure to hold this data, use
it to point the switch CPU port.

This patch simply substitutes s/dst->cpu_switch/dst->cpu_dp->ds/ and
s/dst->cpu_port/dst->cpu_dp->index/.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 2be9632..215d41c 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -228,7 +228,7 @@ static int bcm_sf2_port_setup(struct dsa_switch *ds, int port,
 			      struct phy_device *phy)
 {
 	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
-	s8 cpu_port = ds->dst[ds->index].cpu_port;
+	s8 cpu_port = ds->dst->cpu_dp->index;
 	unsigned int i;
 	u32 reg;
 
@@ -832,7 +832,7 @@ static int bcm_sf2_sw_set_wol(struct dsa_switch *ds, int port,
 {
 	struct net_device *p = ds->dst[ds->index].master_netdev;
 	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
-	s8 cpu_port = ds->dst[ds->index].cpu_port;
+	s8 cpu_port = ds->dst->cpu_dp->index;
 	struct ethtool_wolinfo pwol;
 
 	p->ethtool_ops->get_wol(p, &pwol);