xhci: dbc: add dbgtty request to end of list once it completes

Make sure we move the requests from the read_queue to the end of the
read_pool list, avoiding looping and using the same one request all
the time.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20240905143300.1959279-3-mathias.nyman@linux.intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>