scsi: lpfc: Replace blk_irq_poll intr handler with threaded IRQ

scsi: lpfc: Replace blk_irq_poll intr handler with threaded IRQ

It has been determined that the threaded IRQ API accomplishes effectively
the same performance metrics as blk_irq_poll.  As blk_irq_poll is mostly
scheduled by the softirqd and handled in softirq context, this is not
entirely desired from a Fibre Channel driver context.  A threaded IRQ model
fits cleaner.  This patch replaces the blk_irq_poll logic with threaded
IRQ.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20230417191558.83100-7-justintee8345@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>