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/clk/clk-uclass.c b/drivers/clk/clk-uclass.c
index 4076535..31c5997 100644
--- a/drivers/clk/clk-uclass.c
+++ b/drivers/clk/clk-uclass.c
@@ -161,7 +161,7 @@
 	
 	bulk->count = 0;
 
-	count = dev_count_phandle_with_args(dev, "clocks", "#clock-cells");
+	count = dev_count_phandle_with_args(dev, "clocks", "#clock-cells", 0);
 	if (count < 1)
 		return count;
 
@@ -213,7 +213,7 @@
 	int ret;
 
 	num_parents = dev_count_phandle_with_args(dev, "assigned-clock-parents",
-						  "#clock-cells");
+						  "#clock-cells", 0);
 	if (num_parents < 0) {
 		debug("%s: could not read assigned-clock-parents for %p\n",
 		      __func__, dev);