arch: arm: dts: an7581: add Chip SCU node

Add pending Chip SCU node for clock node.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
diff --git a/arch/arm/dts/an7581-u-boot.dtsi b/arch/arm/dts/an7581-u-boot.dtsi
index 0316b73..9f8abfc 100644
--- a/arch/arm/dts/an7581-u-boot.dtsi
+++ b/arch/arm/dts/an7581-u-boot.dtsi
@@ -11,6 +11,13 @@
 			reg = <0x0 0x80000000 0x0 0x40000>;
 		};
 	};
+
+	soc {
+		chip_scu: syscon@1fa20000 {
+			compatible = "airoha,en7581-chip-scu", "syscon";
+			reg = <0x0 0x1fa20000 0x0 0x388>;
+		};
+	};
 };
 
 &uart1 {