usb: gadget: Mark dm_usb_gadget_handle_interrupts as non-weak for DM_USB_GADGET

usb: gadget: Mark dm_usb_gadget_handle_interrupts as non-weak for DM_USB_GADGET

The dm_usb_gadget_handle_interrupts() is not implemented by any USB
gadget controller drivers which do enable DM_USB_GADGET anymore. Set
the symbol as non-weak.

Signed-off-by: Marek Vasut <[email protected]>
Reviewed-by: Mattijs Korpershoek <[email protected]>
Tested-by: Alexander Sverdlin <[email protected]>
Tested-by: Mattijs Korpershoek <[email protected]> # vim3
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mattijs Korpershoek <[email protected]>