usb: gadget: only GPL drivers in the gadget and phy framework

We only support GPL drivers in the USB Gadget Framework,
it sounds correct to make all exported symbols GPL too.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/phy/phy-generic.c

@@ -54,14 +54,14 @@ void usb_nop_xceiv_register(void)
 		return;
 	}
 }
-EXPORT_SYMBOL(usb_nop_xceiv_register);
+EXPORT_SYMBOL_GPL(usb_nop_xceiv_register);
 
 void usb_nop_xceiv_unregister(void)
 {
 	platform_device_unregister(pd);
 	pd = NULL;
 }
-EXPORT_SYMBOL(usb_nop_xceiv_unregister);
+EXPORT_SYMBOL_GPL(usb_nop_xceiv_unregister);
 
 static int nop_set_suspend(struct usb_phy *x, int suspend)
 {