cleanup use of CFG_ENV_IS_IN_FLASH

- #if CFG_ENV_IS_IN_FLASH
- #if (CFG_ENV_IS_IN_FLASH == 1)
- #define CFG_ENV_IS_IN_FLASH 0

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/board/bmw/flash.c b/board/bmw/flash.c
index 7fba174..6d3cfab 100644
--- a/board/bmw/flash.c
+++ b/board/bmw/flash.c
@@ -224,7 +224,7 @@
 			       &flash_info[0]);
 #endif
 
-#if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
+#if defined(CFG_ENV_IS_IN_FLASH) && defined(CFG_ENV_ADDR)
 		flash_protect (FLAG_PROTECT_SET,
 			       CFG_ENV_ADDR,
 			       CFG_ENV_ADDR + CFG_ENV_SIZE - 1,