ath9k: Add IEEE80211_HW_RX_INCLUDES_FCS to hw flags

Don't trim the FCS before passing the frame to mac80211,
move TSF_TO_TU to core.h and delete more unused macros.

Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 2b3b11b..55f4868 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -1099,7 +1099,7 @@
 		ath_node_put(sc, an, ATH9K_BH_STATUS_CHANGE);
 }
 
-int ath__rx_indicate(struct ath_softc *sc,
+int _ath_rx_indicate(struct ath_softc *sc,
 		     struct sk_buff *skb,
 		     struct ath_recv_status *status,
 		     u16 keyix)
@@ -1119,9 +1119,6 @@
 		skb_pull(skb, padsize);
 	}
 
-	/* remove FCS before passing up to protocol stack */
-	skb_trim(skb, (skb->len - FCS_LEN));
-
 	/* Prepare rx status */
 	ath9k_rx_prepare(sc, skb, status, &rx_status);
 
@@ -1364,7 +1361,8 @@
 		goto bad2;
 	}
 
-	hw->flags = IEEE80211_HW_SIGNAL_DBM |
+	hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
+		IEEE80211_HW_SIGNAL_DBM |
 		IEEE80211_HW_NOISE_DBM;
 
 	SET_IEEE80211_DEV(hw, &pdev->dev);