atheros: use get_unaligned_le*() for bssid mask setting

Historically some macro helpers have been users for this,
AR5K_LOW_ID() and AR5K_HIGH_ID(), use upstream unaligned
helpers instead. This applid to ath5k and ar9170. ath9k
already uses this.

Worth noting is ath5k uses an ah_sta_id but that is already
the MAC address combined with the associaiton ID, ah_sta_id
is really ETH_ALEN in size.

Cc: Bob Copeland <me@bobcopeland.com>
Cc: Nick Kossifidis <mick@madwifi-project.org>
Cc: Christian Lamparter <chunkeey@web.de>
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/ar9170/mac.c b/drivers/net/wireless/ath/ar9170/mac.c
index 614e321..0c6273a6 100644
--- a/drivers/net/wireless/ath/ar9170/mac.c
+++ b/drivers/net/wireless/ath/ar9170/mac.c
@@ -35,6 +35,9 @@
  *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
+
+#include <asm/unaligned.h>
+
 #include "ar9170.h"
 #include "cmd.h"
 
@@ -227,11 +230,8 @@
 
 	ar9170_regwrite_begin(ar);
 
-	ar9170_regwrite(reg,
-			(mac[3] << 24) | (mac[2] << 16) |
-			(mac[1] << 8) | mac[0]);
-
-	ar9170_regwrite(reg + 4, (mac[5] << 8) | mac[4]);
+	ar9170_regwrite(reg, get_unaligned_le32(mac));
+	ar9170_regwrite(reg + 4, get_unaligned_le16(mac + 4));
 
 	ar9170_regwrite_finish();