usb: cdns3: Changed type of gadget_dev in cdns structure

Patch changes the type for gadget_dev pointer in cdns structure from
pointer to cdns3_device structure to void pointer.
This filed is in reusable code and after this change it will be used to
point to both cdns3_device or cdnsp_device objects.

Signed-off-by: Pawel Laszczak <[e-mail]>
Tested-by: Aswath Govindraju <[e-mail]>
Signed-off-by: Peter Chen <[e-mail]>

drivers/usb/cdns3/core.h

···
  * @roles: array of supported roles for this controller
  * @role: current role
  * @host_dev: the child host device pointer for cdns core
- * @gadget_dev: the child gadget device pointer for cdns3 core
+ * @gadget_dev: the child gadget device pointer
  * @usb2_phy: pointer to USB2 PHY
  * @usb3_phy: pointer to USB3 PHY
  * @mutex: the mutex for concurrent code at driver
···
 	struct cdns_role_driver	*roles[USB_ROLE_DEVICE + 1];
 	enum usb_role			role;
 	struct platform_device		*host_dev;
-	struct cdns3_device		*gadget_dev;
+	void				*gadget_dev;
 	struct phy			*usb2_phy;
 	struct phy			*usb3_phy;
 	/* mutext used in workqueue*/