ARM: dts: TI-Nspire: fix cpu compatible value

The change corrects cpu compatible property to a defined one,
see Documentation/devicetree/bindings/arm/cpus.txt
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/nspire.dtsi

@@ -16,7 +16,7 @@ / {
 
 	cpus {
 		cpu@0 {
-			compatible = "arm,arm926ejs";
+			compatible = "arm,arm926ej-s";
 		};
 	};