mips: dts: ralink: mt7621: change phy-mode of gmac1 to rgmii

Change phy-mode of gmac1 to rgmii on mt7621.dtsi. Same code path is
followed for delayed rgmii and rgmii phy-mode on mtk_eth_soc.c.
Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/mips/boot/dts/ralink/mt7621.dtsi

@@ -333,7 +333,7 @@ gmac1: mac@1 {
 			compatible = "mediatek,eth-mac";
 			reg = <1>;
 			status = "disabled";
-			phy-mode = "rgmii-rxid";
+			phy-mode = "rgmii";
 		};
 
 		mdio: mdio-bus {