Revert "ar71xx: enable flow control for ethernet MACs with built-in switch"

This reverts commit 1beb5bec64.

It was found to cause the WAN port to fail on some AR934x devices

Signed-off-by: Felix Fietkau <nbd@nbd.name>

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c

@@ -453,17 +453,9 @@ static void ag71xx_hw_stop(struct ag71xx *ag)
 static void ag71xx_hw_setup(struct ag71xx *ag)
 {
 	struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
-	struct ag71xx_mdio_platform_data *mpdata;
-	u32 init = MAC_CFG1_INIT;
-
-	if (pdata->mii_bus_dev && ag->pdev->id == 0) {
-		mpdata = pdata->mii_bus_dev->platform_data;
-		if (mpdata && mpdata->builtin_switch)
-		    init |= MAC_CFG1_TFC | MAC_CFG1_RFC;
-	}
 
 	/* setup MAC configuration registers */
-	ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, init);
+	ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_INIT);
 
 	ag71xx_sb(ag, AG71XX_REG_MAC_CFG2,
 		  MAC_CFG2_PAD_CRC_EN | MAC_CFG2_LEN_CHECK);