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>

drivers/net/wireless/ath/ath5k/base.c

@@ -594,6 +594,7 @@ ath5k_pci_probe(struct pci_dev *pdev,
 	common = ath5k_hw_common(sc->ah);
 	common->ops = &ath5k_common_ops;
 	common->ah = sc->ah;
+	common->hw = hw;
 	common->cachelsz = csz << 2; /* convert to bytes */
 
 	/* Initialize device */