mac80211: add ieee80211_vif param to tsf functions

TSF can be kept per vif.
Add ieee80211_vif param to set/get/reset_tsf, and move
the debugfs entries to the per-vif directory.

Update all the drivers that implement these callbacks.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/zd1211rw/zd_mac.c

@@ -1332,7 +1332,7 @@ static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
 	}
 }
 
-static u64 zd_op_get_tsf(struct ieee80211_hw *hw)
+static u64 zd_op_get_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
 	struct zd_mac *mac = zd_hw_mac(hw);
 	return zd_chip_get_tsf(&mac->chip);