ARM: dts: am57xx: sbc-am57x: correct Eth PHY settings

Update Eth PHY settings to make it possible to run both phys at 1Gbps.
Signed-off-by: Dmitry Lifshitz <lifshitz@compulab.co.il>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am57xx-cl-som-am57x.dts

@@ -559,13 +559,13 @@ &mac {
 
 &cpsw_emac0 {
 	phy_id = <&davinci_mdio>, <0>;
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-txid";
 	dual_emac_res_vlan = <0>;
 };
 
 &cpsw_emac1 {
 	phy_id = <&davinci_mdio>, <1>;
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-txid";
 	dual_emac_res_vlan = <1>;
 };