arm: dts: k3-j721e-r5-common-proc-board: Hook buck12_reg to vtm supply

Hook buck12_reg to vtm avs supply

Signed-off-by: Keerthy <j-keerthy@ti.com>

arch/arm/dts/k3-j721e-r5-common-proc-board.dts

@@ -179,4 +179,9 @@
 	};
 };
 
+&wkup_vtm0 {
+	vdd-supply-2 = <&buck12_reg>;
+	u-boot,dm-spl;
+};
+
 #include "k3-j721e-common-proc-board-u-boot.dtsi"