ARM: dts: am437x-sk-evm: Hook dcdc2 as the cpu0-supply

Hook dcdc2 as the cpu0-supply.
Signed-off-by: NDave Gerlach <d-gerlach@ti.com>
Tested-by: NFelipe Balbi <balbi@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am437x-sk-evm.dts

@@ -610,3 +610,7 @@
 &wdt {
 	status = "okay";
 };
+
+&cpu {
+	cpu0-supply = <&dcdc2>;
+};