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/calib.c b/drivers/net/wireless/ath/ath9k/calib.c
index 30106f4..bdd4a19 100644
--- a/drivers/net/wireless/ath/ath9k/calib.c
+++ b/drivers/net/wireless/ath/ath9k/calib.c
@@ -278,7 +278,7 @@
 static bool ath9k_hw_iscal_supported(struct ath_hw *ah,
 				     enum ath9k_cal_types calType)
 {
-	struct ieee80211_conf *conf = &ah->ah_sc->hw->conf;
+	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
 
 	switch (calType & ah->supp_cals) {
 	case IQ_MISMATCH_CAL: /* Both 2 GHz and 5 GHz support OFDM */
@@ -555,7 +555,7 @@
 /* This is done for the currently configured channel */
 bool ath9k_hw_reset_calvalid(struct ath_hw *ah)
 {
-	struct ieee80211_conf *conf = &ah->ah_sc->hw->conf;
+	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
 	struct ath9k_cal_list *currCal = ah->cal_list_curr;
 
 	if (!ah->curchan)