davinci: Fixed wrong timebase clock frequency.

Signed-off-by: Manfred Rudigier <manfred.rudigier@omicron.at>
diff --git a/arch/arm/cpu/arm926ejs/davinci/timer.c b/arch/arm/cpu/arm926ejs/davinci/timer.c
index a06d449..93c9e60 100644
--- a/arch/arm/cpu/arm926ejs/davinci/timer.c
+++ b/arch/arm/cpu/arm926ejs/davinci/timer.c
@@ -108,7 +108,7 @@
  */
 ulong get_tbclk(void)
 {
-	return CONFIG_SYS_HZ;
+	return gd->timer_rate_hz;
 }
 
 #ifdef CONFIG_HW_WATCHDOG