scsi: ufs: don't free irq in suspend

If we had called the pm_qos_add_request() with PM QoS request type set to
PM_QOS_REQ_AFFINE_IRQ then freeing up the irq makes the free_irq() to
print out warning with call stack. We don't really need to free up irq
during suspend, disabling it during suspend and reenabling it during
resume should be good enough and that's how it was done on 3.10 kernel
as well.

Change-Id: I58379a05e1f9d5f18b46394d64bdf6f106afa963
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>