drivers: nordic: usbd: Fix long (fragmented) control OUT transfers

Fragmented long CTRL OUT transfers does not work properly, because
they were not handler properly by the shim. In such transfers,
a special call (nrfx_usbd_setup_data_clear()) must be performed
before every data packet and not just before the first one.
This patch adds a byte counter which is set while processing setup
packet (host->device only) to be able to decide whether there will
be more data packets coming (and to call_data_clear() or not).

Fixes #11232 .

Signed-off-by: Paweł Zadrożniak <pawel.zadrozniak@nordicsemi.no>