rename CFG_ENV_IS_IN_FLASH in CONFIG_ENV_IS_IN_FLASH

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/board/iphase4539/flash.c b/board/iphase4539/flash.c
index 4eca467..f8ab51a 100644
--- a/board/iphase4539/flash.c
+++ b/board/iphase4539/flash.c
@@ -75,7 +75,7 @@
 			      flash_info + bank);
 #endif
 
-#ifdef CFG_ENV_IS_IN_FLASH
+#ifdef CONFIG_ENV_IS_IN_FLASH
 		/* ENV protection ON by default */
 		flash_protect(FLAG_PROTECT_SET,
 			      CFG_ENV_ADDR,