s390/qdio: inline qdio_kick_handler()

We don't kick the handler for Input Queues anymore. Move the remaining
code into its only caller.

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