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/cpu/mpc8xx/cpu_init.c b/cpu/mpc8xx/cpu_init.c
index fb3414a..5c43eca 100644
--- a/cpu/mpc8xx/cpu_init.c
+++ b/cpu/mpc8xx/cpu_init.c
@@ -245,7 +245,7 @@
 	rpxclassic_init ();
 #endif
 
-#if defined(CONFIG_RPXLITE) && defined(CFG_ENV_IS_IN_NVRAM)
+#if defined(CONFIG_RPXLITE) && defined(CONFIG_ENV_IS_IN_NVRAM)
 	rpxlite_init ();
 #endif