ath9k: add missing AR9340 in ath_mac_bb_names

AR9340 is not listed in ath_mac_bb_names, which leads to such a message:
ieee80211 phy0: Atheros AR???? Rev:0 mem=0xb8100000, irq=2

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index a0d1147..7bfc8f6 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2754,6 +2754,7 @@
 	{ AR_SREV_VERSION_9271,         "9271" },
 	{ AR_SREV_VERSION_9300,         "9300" },
 	{ AR_SREV_VERSION_9330,         "9330" },
+	{ AR_SREV_VERSION_9340,		"9340" },
 	{ AR_SREV_VERSION_9485,         "9485" },
 };