colibri_imx6: migrate i2c to using driver model

Migrate I2C to using driver model.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
diff --git a/include/configs/colibri_imx6.h b/include/configs/colibri_imx6.h
index f029a88..e51ec85 100644
--- a/include/configs/colibri_imx6.h
+++ b/include/configs/colibri_imx6.h
@@ -32,12 +32,12 @@
 #define CONFIG_MXC_UART_BASE		UART1_BASE
 
 /* I2C Configs */
-#define CONFIG_SYS_I2C
 #define CONFIG_SYS_I2C_MXC
-#define CONFIG_SYS_I2C_MXC_I2C1         /* enable I2C bus 1 */
-#define CONFIG_SYS_I2C_MXC_I2C2         /* enable I2C bus 2 */
-#define CONFIG_SYS_I2C_MXC_I2C3         /* enable I2C bus 3 */
+#define CONFIG_SYS_I2C_MXC_I2C1		/* enable I2C bus 1 */
+#define CONFIG_SYS_I2C_MXC_I2C2		/* enable I2C bus 2 */
+#define CONFIG_SYS_I2C_MXC_I2C3		/* enable I2C bus 3 */
 #define CONFIG_SYS_I2C_SPEED		100000
+#define CONFIG_SYS_MXC_I2C3_SPEED	400000
 
 /* OCOTP Configs */
 #ifdef CONFIG_CMD_FUSE