net: pcs: altera-tse: don't set the speed for 1000BaseX

When disabling the SGMII mode bit, the PCS defaults to 1000BaseX mode.
In that mode, we don't need to set the speed since it's always 1000Mbps.
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/pcs/pcs-altera-tse.c

@@ -102,7 +102,6 @@ static int alt_tse_pcs_config(struct phylink_pcs *pcs, unsigned int mode,
 		if_mode |= PCS_IF_MODE_USE_SGMII_AN | PCS_IF_MODE_SGMII_ENA;
 	} else if (interface == PHY_INTERFACE_MODE_1000BASEX) {
 		if_mode &= ~(PCS_IF_MODE_USE_SGMII_AN | PCS_IF_MODE_SGMII_ENA);
-		if_mode |= PCS_IF_MODE_SGMI_SPEED_1000;
 	}
 
 	ctrl |= (BMCR_SPEED1000 | BMCR_FULLDPLX | BMCR_ANENABLE);