qcacmn: Avoid logging few hif events in case of IRQ storm

In IRQ storm scenario, the events are logged to hif
event desc history even though the SRNG is empty
resulting in overwriting of older entries useful for
debugging.

Fix is to avoid recording hif events if the SRNG is
empty in IRQ storm scenario.

Change-Id: Id4161198c60f5fae31123c936f0f4acc1082a78b
CRs-Fixed: 2753675