usb: dwc2-otg: make regs_otg (in platdata) a uintptr_t

The regs_otg field in uintptr_t of the platform data structure for
dwc2-otg has thus far been an unsigned int, but will eventually be
casted into a void*.

This raises the following error with GCC 6.3 and buildman:
  ../drivers/usb/gadget/dwc2_udc_otg.c: In function 'dwc2_udc_probe':
  ../drivers/usb/gadget/dwc2_udc_otg.c:821:8: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
    reg = (struct dwc2_usbotg_reg *)pdata->regs_otg;
          ^

This changes regs_otg to a uintptr_t to ensure that it is large enough
to hold any valid pointer (and fix the associated warning).

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

include/usb/dwc2_udc.h

@@ -16,7 +16,7 @@ struct dwc2_plat_otg_data {
 	int		phy_of_node;
 	int		(*phy_control)(int on);
 	unsigned int	regs_phy;
-	unsigned int	regs_otg;
+	uintptr_t	regs_otg;
 	unsigned int    usb_phy_ctrl;
 	unsigned int    usb_flags;
 	unsigned int	usb_gusbcfg;