rename CFG_ENV macros to CONFIG_ENV

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/common/env_common.c b/common/env_common.c
index c3946f0..77f9944 100644
--- a/common/env_common.c
+++ b/common/env_common.c
@@ -241,7 +241,7 @@
 	/*
 	 * We must allocate a buffer for the environment
 	 */
-	env_ptr = (env_t *)malloc (CFG_ENV_SIZE);
+	env_ptr = (env_t *)malloc (CONFIG_ENV_SIZE);
 	DEBUGF ("%s[%d] malloced ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
 #endif