mx28evk: Add I2C support

Add I2C support.

Tested by placing a 24LC16 EEPROM into the U50 slot which comes empty from factory.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/board/freescale/mx28evk/iomux.c b/board/freescale/mx28evk/iomux.c
index 00cc0cc..40d8cf6 100644
--- a/board/freescale/mx28evk/iomux.c
+++ b/board/freescale/mx28evk/iomux.c
@@ -159,6 +159,9 @@
 	MX28_PAD_SSP2_MISO__SSP2_D0 | MUX_CONFIG_SSP2,
 	MX28_PAD_SSP2_SS0__SSP2_D3 |
 		(MXS_PAD_3V3 | MXS_PAD_8MA | MXS_PAD_PULLUP),
+	/* I2C */
+	MX28_PAD_I2C0_SCL__I2C0_SCL,
+	MX28_PAD_I2C0_SDA__I2C0_SDA,
 };
 
 #define HW_DRAM_CTL29	(0x74 >> 2)