qsap: Do fsync after qsap file write operations
Incidents like sudden DUT shutdown may corrupt hostapd.conf if DUT goes down before qsap changes on hostapd.conf flushed to flash memory. Avoid this by doing fsync on hostapd.conf after qsap write operations. Change-Id: Ifd52dd9f121ec05cc04ac95f78197bc3197bd55f CRs-Fixed: 2626276
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