usb: gadget: replace usb_gadget::is_dualspeed with max_speed

This commit replaces usb_gadget's is_dualspeed field with
a max_speed field.

[ balbi@ti.com : Fixed DWC3 driver ]

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/s3c-hsudc.c b/drivers/usb/gadget/s3c-hsudc.c
index 20a553b..09ea965 100644
--- a/drivers/usb/gadget/s3c-hsudc.c
+++ b/drivers/usb/gadget/s3c-hsudc.c
@@ -1310,7 +1310,7 @@
 	device_initialize(&hsudc->gadget.dev);
 	dev_set_name(&hsudc->gadget.dev, "gadget");
 
-	hsudc->gadget.is_dualspeed = 1;
+	hsudc->gadget.max_speed = USB_SPEED_HIGH;
 	hsudc->gadget.ops = &s3c_hsudc_gadget_ops;
 	hsudc->gadget.name = dev_name(dev);
 	hsudc->gadget.dev.parent = dev;