ARM: dts: i.MX31: fix cpu compatible value

The change corrects cpu compatible property to a defined one,
see Documentation/devicetree/bindings/arm/cpus.txt
Signed-off-by: NVladimir Zapolskiy <vz@mleia.com>
Cc: Sascha Hauer <kernel@pengutronix.de>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx31.dtsi

@@ -25,7 +25,7 @@
 		#size-cells = <0>;
 
 		cpu {
-			compatible = "arm,arm1136";
+			compatible = "arm,arm1136jf-s";
 			device_type = "cpu";
 		};
 	};