ARM: socfpga: dts: add the a9-scu node for arria10

Add a dts node for the A9 SCU on the Arria10 platform.
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>

arch/arm/boot/dts/socfpga_arria10.dtsi

@@ -281,6 +281,11 @@ rst: rstmgr@ffd05000 {
 			reg = <0xffd05000 0x100>;
 		};
 
+		scu: snoop-control-unit@ffffc000 {
+			compatible = "arm,cortex-a9-scu";
+			reg = <0xffffc000 0x100>;
+		};
+
 		sysmgr: sysmgr@ffd06000 {
 			compatible = "altr,sys-mgr", "syscon";
 			reg = <0xffd06000 0x300>;