usb: dwc2: gadget: initialize op_state for peripheral only configuration

ID status change interrupt will not be handled in peripheral only
configuration. So initialize op_state during gadget init.

Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@intel.com>
Tested-by: Robert Baldyga <r.baldyga@samsung.com>
Tested-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Tested-by: John Youn <johnyoun@synopsys.com>
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc2/gadget.c

@@ -3535,6 +3535,8 @@ int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq)
 	hsotg->gadget.name = dev_name(dev);
 	if (hsotg->dr_mode == USB_DR_MODE_OTG)
 		hsotg->gadget.is_otg = 1;
+	else if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)
+		hsotg->op_state = OTG_STATE_B_PERIPHERAL;
 
 	/* reset the system */