ARM: dts: at91: at91-sama5d27_som1: fix PHY ID

The PHY ID is incorrect. It leads to troubles when resuming from standby
or mem power states.
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Fixes: af690fa3 ("ARM: dts: at91: at91-sama5d27_som1: add sama5d27 SoM1 support")
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>

arch/arm/boot/dts/at91-sama5d27_som1.dtsi

@@ -67,8 +67,8 @@ macb0: ethernet@f8008000 {
 				pinctrl-0 = <&pinctrl_macb0_default>;
 				phy-mode = "rmii";
 
-				ethernet-phy@1 {
-					reg = <0x1>;
+				ethernet-phy@0 {
+					reg = <0x0>;
 					interrupt-parent = <&pioA>;
 					interrupts = <PIN_PD31 IRQ_TYPE_LEVEL_LOW>;
 					pinctrl-names = "default";