of/platform: Staticize of_platform_device_create_pdata()

It is not used outside of this file so doesn't need to be in the global
namespace.
Signed-off-by: NMark Brown <broonie@linaro.org>
Signed-off-by: NGrant Likely <grant.likely@linaro.org>

drivers/of/platform.c

@@ -196,7 +196,7 @@ EXPORT_SYMBOL(of_device_alloc);
  * Returns pointer to created platform device, or NULL if a device was not
  * registered.  Unavailable devices will not get registered.
  */
-struct platform_device *of_platform_device_create_pdata(
+static struct platform_device *of_platform_device_create_pdata(
 					struct device_node *np,
 					const char *bus_id,
 					void *platform_data,