ARM: dts: imx7-colibri: specify cpu-supply

Specify CPU supply using the "cpu-supply" property instead of
the invalid "arm-supply" property.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7-colibri.dtsi

@@ -86,7 +86,7 @@ &adc2 {
 };
 
 &cpu0 {
-	arm-supply = <&reg_DCDC2>;
+	cpu-supply = <&reg_DCDC2>;
 };
 
 &fec1 {