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/net/designware.c b/drivers/net/designware.c
index 1c0e829..4c19abb 100644
--- a/drivers/net/designware.c
+++ b/drivers/net/designware.c
@@ -688,7 +688,8 @@
 	int i, clock_nb;
 
 	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) {
 		priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
 					    GFP_KERNEL);