s390/qdio: remove remaining tasklet & timer code

Both qdio drivers have moved away from using qdio's internal tasklet
and timer mechanisms for Output Queues. Rip out all the leftovers.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>