arm64: dts: imx8mp-verdin: add cpu-supply

Add the cpu-supply property to all CPU nodes to enable the cpufreq
driver.
Signed-off-by: NMax Krummenacher <max.krummenacher@toradex.com>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi

@@ -146,6 +146,22 @@
 	};
 };
 
+&A53_0 {
+	cpu-supply = <&reg_vdd_arm>;
+};
+
+&A53_1 {
+	cpu-supply = <&reg_vdd_arm>;
+};
+
+&A53_2 {
+	cpu-supply = <&reg_vdd_arm>;
+};
+
+&A53_3 {
+	cpu-supply = <&reg_vdd_arm>;
+};
+
 &cpu_alert0 {
 	temperature = <95000>;
 };
@@ -453,7 +469,7 @@
 				regulator-ramp-delay = <3125>;
 			};
 
-			BUCK2 {
+			reg_vdd_arm: BUCK2 {
 				nxp,dvs-run-voltage = <950000>;
 				nxp,dvs-standby-voltage = <850000>;
 				regulator-always-on;