net: ti: icssg_prueth: Fix argument passed to icssg_update_rgmii_cfg()

icssg_update_mii_rt_cfg() accepts slice number as the 3rd argument
which indicate if it is for MII0 or MII1. So fix emac_adjust_link()
pass slice for link down case.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>

drivers/net/ethernet/ti/icssg_prueth.c

@@ -992,7 +992,7 @@ static void emac_adjust_link(struct net_device *ndev)
 						slice);
 		} else {
 			icssg_update_rgmii_cfg(prueth->miig_rt, true, true,
-					       emac->port_id);
+					       slice);
 			icssg_update_mii_rt_cfg(prueth->mii_rt, emac->speed,
 						slice);
 		}