dm: add cells_count parameter in *_count_phandle_with_args

The cell_count argument is required when cells_name is NULL.

This patch adds this parameter in live tree API
- of_count_phandle_with_args
- ofnode_count_phandle_with_args
- dev_count_phandle_with_args

This parameter solves issue when these API is used to count
the number of element of a cell without cell name. This parameter
allow to force the size cell.

For example:
  count = dev_count_phandle_with_args(dev, "array", NULL, 3);

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/usb/host/ohci-da8xx.c b/drivers/usb/host/ohci-da8xx.c
index 22e7b56..aa1eba2 100644
--- a/drivers/usb/host/ohci-da8xx.c
+++ b/drivers/usb/host/ohci-da8xx.c
@@ -95,7 +95,8 @@
 
 	err = 0;
 	priv->clock_count = 0;
-	clock_nb = dev_count_phandle_with_args(dev, "clocks", "#clock-cells");
+	clock_nb = dev_count_phandle_with_args(dev, "clocks", "#clock-cells",
+					       0);
 
 	if (clock_nb < 0)
 		return clock_nb;