ath9k: fix compile error in debug.c

drivers/net/wireless/ath9k/debug.c: In function 'read_file_wiphy':
drivers/net/wireless/ath9k/debug.c:377: error: implicit declaration of
function 'put_unaligned_le32'
drivers/net/wireless/ath9k/debug.c:378: error: implicit declaration of
function 'put_unaligned_le16'

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/debug.c

@@ -14,6 +14,8 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include <asm/unaligned.h>
+
 #include "ath9k.h"
 
 static unsigned int ath9k_debug = DBG_DEFAULT;