net: dsa: felix: remove "xgmii" phy-mode

The felix driver runs only on NXP LS1028A, which most definitely does
not support the parallel 10G interface, just USXGMII, and that only up
to 2.5Gbps (toned down from 10 Gbps via symbol replication).

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
diff --git a/drivers/net/mscc_eswitch/felix_switch.c b/drivers/net/mscc_eswitch/felix_switch.c
index 6a689ee..0cab671 100644
--- a/drivers/net/mscc_eswitch/felix_switch.c
+++ b/drivers/net/mscc_eswitch/felix_switch.c
@@ -222,7 +222,6 @@
 	case PHY_INTERFACE_MODE_QSGMII:
 		felix_init_sgmii(imdio, port, autoneg);
 		break;
-	case PHY_INTERFACE_MODE_XGMII:
 	case PHY_INTERFACE_MODE_10GBASER:
 	case PHY_INTERFACE_MODE_USXGMII:
 		if (felix_init_sxgmii(imdio, port))