iwlwifi: adjust TSF in IBSS

This patch makes the driver, in IBSS mode, comply with TSF requirements
in 2 ways:
1. It notifies mac80211 of its TSF timestamp.
2. It uses the given timestamp in the beacon template to update the ucode.

Signed-off-by: Assaf Krauss <assaf.krauss@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index bfe1ad2..0c734fd 100644
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -1063,7 +1063,6 @@
 		return;
 	}
 
-	stats->flag = 0;
 	hdr = (struct ieee80211_hdr *)rxb->skb->data;
 
 	/*  in case of HW accelerated crypto and bad decryption, drop */
@@ -1197,6 +1196,7 @@
 
 	rx_status.antenna = 0;
 	rx_status.flag = 0;
+	rx_status.flag |= RX_FLAG_TSFT;
 
 	if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
 		IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",