ARM: dts: imx53: drop "fsl,imx-ckih2"

"fsl,imx-ckih2" is useless since no driver deals with it, so let's drop it.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx53.dtsi

@@ -98,7 +98,7 @@
 		};
 
 		ckih2 {
-			compatible = "fsl,imx-ckih2", "fixed-clock";
+			compatible = "fixed-clock";
 			#clock-cells = <0>;
 			clock-frequency = <0>;
 		};