ARM: dts: Change I2C2 and I2C3 to 400KHz for LogicPD Torpedo DM3730 devkit

When used with the Logic PD development kit, this makes the I2C buses match
the BSP released by Logic PD.

Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/logicpd-torpedo-som.dtsi

@@ -104,6 +104,14 @@
 	};
 };
 
+&i2c2 {
+	clock-frequency = <400000>;
+};
+
+&i2c3 {
+	clock-frequency = <400000>;
+};
+
 /*
  * Only found on the wireless SOM. For the SOM without wireless, the pins for
  * MMC3 can be routed with jumpers to the second MMC slot on the devkit and