atheros: add ieee80211_hw to ath_common

Make use of it on hw code in ath9k to avoid
using the ath9k ath_softc.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index d752b16..6935557 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1571,6 +1571,7 @@
 	common = ath9k_hw_common(ah);
 	common->ops = &ath9k_common_ops;
 	common->ah = ah;
+	common->hw = sc->hw;
 
 	/*
 	 * Cache line size is used to size and align various