ARM: socfpga: dts: add the a9-scu node

Add the dts node for the A9 SCU.
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>

arch/arm/boot/dts/socfpga.dtsi

@@ -655,6 +655,11 @@ spi0: spi@fff00000 {
 			status = "disabled";
 		};
 
+		scu: snoop-control-unit@fffec000 {
+			compatible = "arm,cortex-a9-scu";
+			reg = <0xfffec000 0x100>;
+		};
+
 		spi1: spi@fff01000 {
 			compatible = "snps,dw-apb-ssi";
 			#address-cells = <1>;