scsi: lpfc: Fix FCP hba_wqidx assignment

The driver is encountering  oops in lpfc_sli_calc_ring.

The driver is setting hba_wqidx for FCP based on the policy in use for
NVME. The two may not be the same.  Change to set the wqidx based on the
FCP policy.

Cc: <stable@vger.kernel.org> # 4.12+
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>