s390/qdio: clean up usage of qdio_data

This removes the last remaining accesses to ->qdio_data from internal
code. Just pass the qdio_irq struct where needed instead.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>