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>
diff --git a/drivers/net/wireless/adm8211.c b/drivers/net/wireless/adm8211.c
index 43ebc44..3b752d9 100644
--- a/drivers/net/wireless/adm8211.c
+++ b/drivers/net/wireless/adm8211.c
@@ -1249,7 +1249,8 @@
 	return 0;
 }
 
-static u64 adm8211_get_tsft(struct ieee80211_hw *dev)
+static u64 adm8211_get_tsft(struct ieee80211_hw *dev,
+			    struct ieee80211_vif *vif)
 {
 	struct adm8211_priv *priv = dev->priv;
 	u32 tsftl;