ath9k: move driver keymap, keymax and splitmic to common

This will make sharing code easier between ath9k and ath9k_htc.

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/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index c4a8663..3abefb5 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -856,7 +856,7 @@
 			   && !decrypt_error && skb->len >= hdrlen + 4) {
 			keyix = skb->data[hdrlen + 3] >> 6;
 
-			if (test_bit(keyix, sc->keymap))
+			if (test_bit(keyix, common->keymap))
 				rxs->flag |= RX_FLAG_DECRYPTED;
 		}
 		if (ah->sw_mgmt_crypto &&