carl9170: import 1.9.7 firmware headers

Import new headers from my firmware branch:
<https://github.com/chunkeey/carl9170fw>

visit our wiki at:
<http://wireless.kernel.org/en/users/Drivers/carl9170.fw>

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/carl9170/hw.h b/drivers/net/wireless/ath/carl9170/hw.h
index fa834c1..0db874a 100644
--- a/drivers/net/wireless/ath/carl9170/hw.h
+++ b/drivers/net/wireless/ath/carl9170/hw.h
@@ -384,7 +384,7 @@
 
 #define	AR9170_MAC_REG_BCN_ADDR			(AR9170_MAC_REG_BASE + 0xd84)
 #define	AR9170_MAC_REG_BCN_LENGTH		(AR9170_MAC_REG_BASE + 0xd88)
-#define		AR9170_MAC_BCN_LENGTH_MAX		256
+#define		AR9170_MAC_BCN_LENGTH_MAX		(512 - 32)
 
 #define AR9170_MAC_REG_BCN_STATUS		(AR9170_MAC_REG_BASE + 0xd8c)