imx31_litekit: Place machine ID into board config

Let common code set the machine ID.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/include/configs/imx31_litekit.h b/include/configs/imx31_litekit.h
index 2a02b3d..5e976bc 100644
--- a/include/configs/imx31_litekit.h
+++ b/include/configs/imx31_litekit.h
@@ -41,6 +41,8 @@
 
 #define CONFIG_SYS_TEXT_BASE	0xa0000000
 
+#define CONFIG_MACH_TYPE	MACH_TYPE_MX31LITE
+
 /* Temporarily disabled */
 #if 0
 #define CONFIG_OF_LIBFDT		1