ARM: ls1021a: dtsi: add 'big-endian' property for scfg node

On LS1021A SoC, the scfg device is in BE mode.
Signed-off-by: NXiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/ls1021a.dtsi

@@ -142,6 +142,7 @@
 		scfg: scfg@1570000 {
 			compatible = "fsl,ls1021a-scfg", "syscon";
 			reg = <0x0 0x1570000 0x0 0x10000>;
+			big-endian;
 		};
 
 		clockgen: clocking@1ee1000 {