scsi: mpt3sas: Move a little data from the stack onto the heap

Fixes the following W=1 kernel build warning(s):

 drivers/scsi/mpt3sas/mpt3sas_scsih.c: In function ‘_scsih_scan_for_devices_after_reset’:
 drivers/scsi/mpt3sas/mpt3sas_scsih.c:10473:1: warning: the frame size of 1064 bytes is larger than 1024 bytes [-Wframe-larger-than=]

Link: https://lore.kernel.org/r/20210303144631.3175331-31-lee.jones@linaro.org


Cc: Sathya Prakash <sathya.prakash@broadcom.com>
Cc: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Cc: Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: MPT-FusionLinux.pdl@avagotech.com
Cc: MPT-FusionLinux.pdl@broadcom.com
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>