rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/drivers/rtc/ds1556.c b/drivers/rtc/ds1556.c
index 7574626..763d22a 100644
--- a/drivers/rtc/ds1556.c
+++ b/drivers/rtc/ds1556.c
@@ -43,7 +43,7 @@
 static uchar bin2bcd   (unsigned int n);
 static unsigned bcd2bin(uchar c);
 
-#define RTC_BASE		( CFG_NVRAM_SIZE + CFG_NVRAM_BASE_ADDR )
+#define RTC_BASE		( CONFIG_SYS_NVRAM_SIZE + CONFIG_SYS_NVRAM_BASE_ADDR )
 
 #define RTC_YEAR		( RTC_BASE + 0xf )
 #define RTC_MONTH		( RTC_BASE + 0xe )