arm: dts: corstone1000: enable secondary cores for FVP

Add the secondary cores nodes in the dts file

Signed-off-by: Harsimran Singh Tungal <harsimransingh.tungal@arm.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Rui Miguel Silva <rui.silva@linaro.org>
diff --git a/arch/arm/dts/corstone1000.dtsi b/arch/arm/dts/corstone1000.dtsi
index 1e0ec07..5d9d95b 100644
--- a/arch/arm/dts/corstone1000.dtsi
+++ b/arch/arm/dts/corstone1000.dtsi
@@ -21,7 +21,7 @@
 		stdout-path = "serial0:115200n8";
 	};
 
-	cpus {
+	cpus: cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;