timer: altera: Remove the codes to get clock frequency

Since we have timer uclass to get clock frequency for us, remove
the custom version in the altera timer driver.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Simon Glass <sjg@chromium.org>

drivers/timer/altera_timer.c

@@ -32,7 +32,6 @@ struct altera_timer_regs {
 
 struct altera_timer_platdata {
 	struct altera_timer_regs *regs;
-	unsigned long clock_rate;
 };
 
 static int altera_timer_get_count(struct udevice *dev, unsigned long *count)
@@ -54,12 +53,9 @@ static int altera_timer_get_count(struct udevice *dev, unsigned long *count)
 
 static int altera_timer_probe(struct udevice *dev)
 {
-	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 	struct altera_timer_platdata *plat = dev->platdata;
 	struct altera_timer_regs *const regs = plat->regs;
 
-	uc_priv->clock_rate = plat->clock_rate;
-
 	writel(0, &regs->status);
 	writel(0, &regs->control);
 	writel(ALTERA_TIMER_STOP, &regs->control);
@@ -78,8 +74,6 @@ static int altera_timer_ofdata_to_platdata(struct udevice *dev)
 	plat->regs = map_physmem(dev_get_addr(dev),
 				 sizeof(struct altera_timer_regs),
 				 MAP_NOCACHE);
-	plat->clock_rate = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
-		"clock-frequency", 0);
 
 	return 0;
 }