ARM: dts: sunxi: Switch from phy to phy-handle

The phy device tree property has been deprecated in favor of phy-handle,
let's replace it.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm/boot/dts/sun4i-a10-hackberry.dts

@@ -80,7 +80,7 @@
 };
 
 &emac {
-	phy = <&phy0>;
+	phy-handle = <&phy0>;
 	status = "okay";
 };