wandboard: Add support for Carrier Board MicroSD card

Allow use of the carrier board MicroSD card available in the
Wandboard; this allow for loading alternative system from the other
card for testing or upgrade proposes.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
diff --git a/include/configs/wandboard.h b/include/configs/wandboard.h
index 0dc3286..9898f55 100644
--- a/include/configs/wandboard.h
+++ b/include/configs/wandboard.h
@@ -59,6 +59,7 @@
 /* MMC Configuration */
 #define CONFIG_FSL_ESDHC
 #define CONFIG_FSL_USDHC
+#define CONFIG_SYS_FSL_USDHC_NUM	2
 #define CONFIG_SYS_FSL_ESDHC_ADDR	0
 
 #define CONFIG_MMC