usb: dwc3: of-simple: remove include of clk-provider.h

The header clk-provider.h is there for clock drivers (providers) to
include, not client drivers (consumers).  That said,
of_clk_get_parent_count() is a helper function for clock providers, not
a clk API for consumers.

Let's replace of_clk_get_parent_count() with of_count_phandle_with_args()
call, so that we can remove the include of clk-provider.h.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/dwc3-of-simple.c

@@ -25,7 +25,6 @@
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/clk.h>
-#include <linux/clk-provider.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/pm_runtime.h>
@@ -96,7 +95,8 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, simple);
 	simple->dev = dev;
 
-	ret = dwc3_of_simple_clk_init(simple, of_clk_get_parent_count(np));
+	ret = dwc3_of_simple_clk_init(simple, of_count_phandle_with_args(np,
+						"clocks", "#clock-cells"));
 	if (ret)
 		return ret;