rename CFG_ENV_IS_IN_NVRAM in CONFIG_ENV_IS_IN_NVRAM

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/lib_mips/board.c b/lib_mips/board.c
index 09b8b3b..64ca200 100644
--- a/lib_mips/board.c
+++ b/lib_mips/board.c
@@ -35,7 +35,7 @@
 
 #if ( ((CFG_ENV_ADDR+CFG_ENV_SIZE) < CFG_MONITOR_BASE) || \
       (CFG_ENV_ADDR >= (CFG_MONITOR_BASE + CFG_MONITOR_LEN)) ) || \
-    defined(CFG_ENV_IS_IN_NVRAM)
+    defined(CONFIG_ENV_IS_IN_NVRAM)
 #define	TOTAL_MALLOC_LEN	(CFG_MALLOC_LEN + CFG_ENV_SIZE)
 #else
 #define	TOTAL_MALLOC_LEN	CFG_MALLOC_LEN