scsi: mpi3mr: Code refactor of IOC init - part1

scsi: mpi3mr: Code refactor of IOC init - part1

BugLink: https://bugs.launchpad.net/bugs/1967116
Separate out reply and sense buffer allocation and initialization into two
routines and call only initialization routine while issuing the IOC Init
request message.

Also move out the event enable logic to a separate function.

Link: https://lore.kernel.org/r/20211220141159.16117-13-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit e3605f65ef69f399aaade423f19f6db6eb3c11cb)
Signed-off-by: Jeff Lane <jeffrey.lane@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Paolo Pisati <paolo.pisati@canonical.com>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>