scsi: mpt3sas: Replace dynamic allocations with local variables

mpt3sas_scsih.c:_scsih_scan_for_devices_after_reset() allocates and fetches
a MPI2_CONFIG_PAGE_RAID_VOL_0 struct (Mpi2RaidVolPage0_t) and a
MPI2_CONFIG_PAGE_RAID_VOL_1 struct (Mpi2RaidVolPage1_t), but does not
include the terminal flexible array members in the struct size
calculations, fetch those members, or otherwise use those members in any
way.

These dynamic allocations can be replaced with local variables.

Signed-off-by: James Seo <james@equiv.tech>
Link: https://lore.kernel.org/r/20230806170604.16143-13-james@equiv.tech


Tested-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>