rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/board/sandburst/metrobox/config.mk b/board/sandburst/metrobox/config.mk
index 91aee2f..565e826 100644
--- a/board/sandburst/metrobox/config.mk
+++ b/board/sandburst/metrobox/config.mk
@@ -34,5 +34,5 @@
 endif
 
 ifeq ($(dbcr),1)
-PLATFORM_CPPFLAGS += -DCFG_INIT_DBCR=0x8cff0000
+PLATFORM_CPPFLAGS += -DCONFIG_SYS_INIT_DBCR=0x8cff0000
 endif