When nvme is enabled, change the default for two parameters:
 sg_seg_cnt - raise the per-io sg list size so that 1MB ios are
     supported (based on a 4k buffer per element).
 iocb_cnt - raise the number of buffers used for things like
     NVME LS request/responses to allow more concurrent requests
     to for larger nvme configs.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>