Currently the driver flushes all the scan results during ACS request, and then scans the specific channels as mentioned in the request, which leads to a scan again for the STA interface as no scan results are available. Fix is to have a timestamp, and get only the latest scan results, instead of the scan database flush. Change-Id: Icc343fcca77fb7074071ca1d467947ef70fd1930 CRs-Fixed: 2446490