ARM: dts: i.MX27: Remove clock name from CPU node

Clock name is not needed for "cpufreq-cpu0".
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx27.dtsi

@@ -63,7 +63,6 @@ cpu: cpu@0 {
 			>;
 			clock-latency = <62500>;
 			clocks = <&clks 18>;
-			clock-names = "cpu";
 			voltage-tolerance = <5>;
 		};
 	};