scsi: megaraid_sas: NVME fast path io support

scsi: megaraid_sas: NVME fast path io support

Orabug: 26608922

This patch provide true fast path IO support.  Driver creates PRP for
NVME drives and send Fast Path for performance.  Certain h/w requirement
needs to be taken care in driver.

Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 33203bc4d61b33f1f7bb736eac0c6fdd20b92397)
Signed-off-by: Somasundaram Krishnasamy <somasundaram.krishnasamy@oracle.com>
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>
Conflicts:
	drivers/scsi/megaraid/megaraid_sas.h
	drivers/scsi/megaraid/megaraid_sas_fp.c