rename CFG_ENV_IS_NOWHERE in CONFIG_ENV_IS_NOWHERE

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/include/configs/evb4510.h b/include/configs/evb4510.h
index 1571477..f2ed0df 100644
--- a/include/configs/evb4510.h
+++ b/include/configs/evb4510.h
@@ -172,7 +172,7 @@
 
 /* environment settings */
 #define CFG_ENV_IS_IN_FLASH
-#undef CFG_ENV_IS_NOWHERE
+#undef CONFIG_ENV_IS_NOWHERE
 
 #define CFG_ENV_ADDR		(CFG_FLASH_BASE + 0x20000) /* environment start address */
 #define CFG_ENV_SECT_SIZE	0x10000	   /* Total Size of Environment Sector */