board: usb: Replace legacy usb_gadget_handle_interrupts()

The usb_gadget_handle_interrupts() is no longer used anywhere,
replace the remaining uses with dm_usb_gadget_handle_interrupts()
which takes udevice as a parameter.

Some of the UDC drivers currently ignore the index parameter altogether,
those also ignore the udevice and have to be reworked. Other like the
dwc3_uboot_handle_interrupt() had to be switched from index to udevice
look up to avoid breakage.

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com> # on khadas vim3
Signed-off-by: Marek Vasut <marex@denx.de>

drivers/usb/host/usb-sandbox.c

@@ -130,11 +130,6 @@ int dm_usb_gadget_handle_interrupts(struct udevice *dev)
 	return 0;
 }
 #else
-int usb_gadget_handle_interrupts(int index)
-{
-	return 0;
-}
-
 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
 {
 	struct sandbox_udc *dev = this_controller;