megaraid_sas: Permit large RAID0/1 requests

megaraid_sas: Permit large RAID0/1 requests

Orabug: 19625877

Allow max_sectors to be tuned to enable I/O request sizes of 1MB. This
is not supported for RAID5/6 volumes but the UEK[23] kernels lack an
infrastructure for communicating per-LUN request size limits. This has
been remedied by upstream commit bcdb247c6b6a.

In the meantime allow setting the max_sectors module parameter to 1MB
for Invader and Fury cards.

Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Guangyu Sun <guangyu.sun@oracle.com>
(cherry picked from commit 54e01aad1ef694d7ec4026d2efb5c8d19f981513)
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>