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In order to be able to predict the next DTIM TBTT in the driver, add the ability to use timing data from beacons only with the new hardware flag IEEE80211_HW_TIMING_BEACON_ONLY and the BSS info value sync_dtim_count which is only valid if the timing data came from a beacon. The data can only come from a beacon, and if no beacon was received before association it is updated later together with the DTIM count notification. Signed-off-by: Johannes Berg <johannes.berg@intel.com>