As the ENABLE_IRQ_POLL macro is undefined, the check for ENABLE_IRQ_POLL
macro in ISR will always be false. This leads to irq polling being
non-functional.

Remove ENABLE_IRQ_POLL check from ISR.

Link: https://lore.kernel.org/r/20200715120153.20512-1-chandrakanth.patil@broadcom.com
Fixes: a6ffd5bf ("scsi: megaraid_sas: Call disable_irq from process IRQ")
Cc: <stable@vger.kernel.org> # v5.3+
Signed-off-by: Chandrakanth Patil <chandrakanth.patil@broadcom.com>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>