ARM: shmobile: Update r7s72100 DTS to include CPU frequency

Add CPU Frequency information to the r7s72100 DTS file. This
will allow us to use the shared C code on r7s72100 and Genmai
which reads out the clock frequency from DT and calculates the
delay settings from there.
Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r7s72100.dtsi

@@ -144,6 +144,7 @@ cpu@0 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a9";
 			reg = <0>;
+			clock-frequency = <400000000>;
 		};
 	};