ARM: dts: armada-xp-rn2120: add pinmuxing for ethernet

Up to now working ethernet depended on the bootloader to configure the
pinmuxing. Make it explicit.

As a side effect this change makes ethernet work in barebox.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/armada-xp-netgear-rn2120.dts

@@ -164,12 +164,18 @@ phy1: ethernet-phy@1 { /* Marvell 88E1318 */
 			};
 
 			ethernet@70000 {
+				pinctrl-0 = <&ge0_rgmii_pins>;
+				pinctrl-names = "default";
+
 				status = "okay";
 				phy = <&phy0>;
 				phy-mode = "rgmii-id";
 			};
 
 			ethernet@74000 {
+				pinctrl-0 = <&ge1_rgmii_pins>;
+				pinctrl-names = "default";
+
 				status = "okay";
 				phy = <&phy1>;
 				phy-mode = "rgmii-id";