usb: dwc3: gadget: Set lpm_capable

All DWC3 controllers are LPM capable. Report that in the
usb_gadget.lpm_capable for the gadget driver to properly output the
bcdUSB value in the descriptor.
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/gadget.c

@@ -3301,6 +3301,7 @@ int dwc3_gadget_init(struct dwc3 *dwc)
 	dwc->gadget.sg_supported	= true;
 	dwc->gadget.name		= "dwc3-gadget";
 	dwc->gadget.is_otg		= dwc->dr_mode == USB_DR_MODE_OTG;
+	dwc->gadget.lpm_capable		= true;
 
 	/*
 	 * FIXME We might be setting max_speed to <SUPER, however versions