rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/cpu/arm926ejs/at91/timer.c b/cpu/arm926ejs/at91/timer.c
index c79ec7e..fec545b 100644
--- a/cpu/arm926ejs/at91/timer.c
+++ b/cpu/arm926ejs/at91/timer.c
@@ -130,7 +130,7 @@
 {
 	ulong tbclk;
 
-	tbclk = CFG_HZ;
+	tbclk = CONFIG_SYS_HZ;
 	return tbclk;
 }