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

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

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

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