drivers: ethernet: vsc8541: remove forcing 1000Mbps speeds

The driver was trying to force the PHY to operate at 1000 Mbps speeds by
setting some register bits, but since auto-negotiation was enabled by
default this did not do anything. Remove this.

Signed-off-by: Robert Hancock <robert.hancock@calian.com>

Author: robhancocksed

drivers/ethernet/phy/phy_microchip_vsc8541.c

@@ -245,20 +245,6 @@ static int phy_mc_vsc8541_reset(const struct device *dev)
 		return ret;
 	}
 
-	/* we use limited advertising, to force gigabit speed */
-	/* initial version of this driver supports only 1GB/s */
-
-	/* 1000MBit/s + AUTO */
-	ret = phy_mc_vsc8541_write(dev, PHY_REG_PAGE0_ADV, (1 << 8) | (1 << 6) | 0x01);
-	if (ret) {
-		return ret;
-	}
-
-	ret = phy_mc_vsc8541_write(dev, PHY_REG_PAGE0_CTRL1000, (1 << 12) | (1 << 11) | (1 << 9));
-	if (ret) {
-		return ret;
-	}
-
 	/* start auto negotiation */
 	ret = phy_mc_vsc8541_write(dev, PHY_REG_PAGE0_BMCR, BMCR_ANENABLE | BMCR_ANRESTART);
 	if (ret) {