arm: spear6xx: fix spaces in spear600-evb.dts

This commit fixes a minor coding style issue in spear600-evb.dts:
missing spaces around equal sign.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NOlof Johansson <olof@lixom.net>

arch/arm/boot/dts/spear600-evb.dts

@@ -55,7 +55,7 @@
 
 &smi {
 	status = "okay";
-	clock-rate=<50000000>;
+	clock-rate = <50000000>;
 
 	flash@f8000000 {
 		#address-cells = <1>;