wdt: Update uclass to make clear that the timeout is in ms

Convert name to show explicitly that we are using milliseconds. For a
watchdog timer this is precise enough.

No functional change intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c
index bb9ae80..8a30f02 100644
--- a/drivers/watchdog/wdt-uclass.c
+++ b/drivers/watchdog/wdt-uclass.c
@@ -13,14 +13,14 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-int wdt_start(struct udevice *dev, u64 timeout, ulong flags)
+int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
 {
 	const struct wdt_ops *ops = device_get_ops(dev);
 
 	if (!ops->start)
 		return -ENOSYS;
 
-	return ops->start(dev, timeout, flags);
+	return ops->start(dev, timeout_ms, flags);
 }
 
 int wdt_stop(struct udevice *dev)