ARM: mach-mx5/mx53_ard: Add missing definition

commit 9203d59 (ARM:mach-mx5/mx53_ard: Add I2C2 and I2C3 support) missed to include
the define for ARD_I2CPORTEXP_B.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-mx5/board-mx53_ard.c

@@ -38,6 +38,7 @@
 #define ARD_ETHERNET_INT_B	IMX_GPIO_NR(2, 31)
 #define ARD_SD1_CD		IMX_GPIO_NR(1, 1)
 #define ARD_SD1_WP		IMX_GPIO_NR(1, 9)
+#define ARD_I2CPORTEXP_B	IMX_GPIO_NR(2, 3)
 
 static iomux_v3_cfg_t mx53_ard_pads[] = {
 	/* UART1 */