i386: Fix malloc initialization

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
diff --git a/include/configs/sc520_spunk.h b/include/configs/sc520_spunk.h
index f3fc960..cf5633c 100644
--- a/include/configs/sc520_spunk.h
+++ b/include/configs/sc520_spunk.h
@@ -63,7 +63,7 @@
 /*
  * Size of malloc() pool
  */
-#define CONFIG_MALLOC_SIZE	(CONFIG_ENV_SIZE + 128*1024)
+#define CONFIG_SYS_MALLOC_LEN	(CONFIG_ENV_SIZE + 128*1024)
 
 
 #define CONFIG_BAUDRATE		9600