zfcp: inline zfcp_qdio_setup_init_data()

In preparation for a subsequent patch, move the setup of init_data into
the 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>