ARM: dts: imx23-olinuxino: Add i2c support

The imx23-olinuxino board has an i2c interface exposed on UEXT connector.
This patch enables i2c and selects the pin group used on UEXT connector.
Tested with MOD-LCD1x9 from Olimex.

This patch is based on work by Fadil Berisha with his permission. However
all bugs are mine.
Signed-off-by: Harald Geyer <harald@ccbib.org>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx23-olinuxino.dts

@@ -73,6 +73,12 @@ lradc@80050000 {
 				status = "okay";
 			};
 
+			i2c: i2c@80058000 {
+				pinctrl-names = "default";
+				pinctrl-0 = <&i2c_pins_b>;
+				status = "okay";
+			};
+
 			duart: serial@80070000 {
 				pinctrl-names = "default";
 				pinctrl-0 = <&duart_pins_a>;