ARM: dts: i.MX51: digi-connectcore-som: Add support for I2C bus recovery

Define the required properties to enable I2C bus recovery supported by
the I2C subsystem.
This patch adds GPIO based I2C fault injector for Digi Connectcore SOM.
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx51-digi-connectcore-som.dtsi

@@ -174,9 +174,12 @@ &fec {
 };
 
 &i2c2 {
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c2>;
+	pinctrl-1 = <&pinctrl_i2c2_gpio>;
 	clock-frequency = <400000>;
+	scl-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
+	sda-gpios = <&gpio1 3 GPIO_ACTIVE_HIGH>;
 	status = "okay";
 
 	mma7455l@1d {
@@ -290,6 +293,13 @@ MX51_PAD_GPIO1_3__I2C2_SDA		0x400001ed
 			>;
 		};
 
+		pinctrl_i2c2_gpio: i2c2gpiogrp {
+			fsl,pins = <
+				MX51_PAD_GPIO1_2__GPIO1_2		0x400001ed
+				MX51_PAD_GPIO1_3__GPIO1_3		0x400001ed
+			>;
+		};
+
 		pinctrl_nfc: nfcgrp {
 			fsl,pins = <
 				MX51_PAD_NANDF_D0__NANDF_D0		0x80000000