In dfs test mode, 18 pulses are injected in a single burst, the host
driver reports the radar found event two or three times to
upper layer. For a single burst of radar pulses, radar found event
should be reported only once.
Fix the multiple radar founds for a single burst by disabling radar
detection and flushing the existing radar pulses from all queues
while processing the current radar found indication event in dfs test
mode (usenol=0).
Change-Id: I70c7c15147a5cde038773fd97735c113ca385932
CRs-Fixed: 2981217
83065ffe1e