scsi: megaraid_sas: Use synchronize_irq to wait for IRQs to complete

scsi: megaraid_sas: Use synchronize_irq to wait for IRQs to complete

Orabug: 26608922

FIX - Do not use random delay to synchronize with IRQ. Use kernel API.

Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@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>
[ Upstream commit 29206da1490a7065e8a03ec43f6de60c5c978cae ]
[ Added drivers/scsi/megaraid/kcompat.h to resolve pci_irq_vector symbol ]
Signed-off-by: Somasundaram Krishnasamy <somasundaram.krishnasamy@oracle.com>
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>