rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/cpu/mpc5xxx/interrupts.c b/cpu/mpc5xxx/interrupts.c
index 8816dd1..6035771 100644
--- a/cpu/mpc5xxx/interrupts.c
+++ b/cpu/mpc5xxx/interrupts.c
@@ -229,7 +229,7 @@
 
 int interrupt_init_cpu(ulong * decrementer_count)
 {
-	*decrementer_count = get_tbclk() / CFG_HZ;
+	*decrementer_count = get_tbclk() / CONFIG_SYS_HZ;
 
 	mpc5xxx_init_irq();