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/Makefile b/Makefile
index e8bbd78..b2a4853 100644
--- a/Makefile
+++ b/Makefile
@@ -1063,7 +1063,7 @@
 		  $(XECHO) "... with LCD display ..."; \
 		}
 	@[ -z "$(findstring _NVRAM,$@)" ] || \
-		{ echo "#define  CFG_ENV_IS_IN_NVRAM"	>>$(obj)include/config.h ; \
+		{ echo "#define  CONFIG_ENV_IS_IN_NVRAM"	>>$(obj)include/config.h ; \
 		  $(XECHO) "... with ENV in NVRAM ..."; \
 		}
 	@$(MKCONFIG) -a RPXlite_DW ppc mpc8xx RPXlite_dw