ath9k: Clean antenna configuration for 4K EEPROM chips

This patch revamps the antenna configuration mechanism
for 4K chips.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/phy.h b/drivers/net/wireless/ath/ath9k/phy.h
index 5317e05..e83cd4a 100644
--- a/drivers/net/wireless/ath/ath9k/phy.h
+++ b/drivers/net/wireless/ath/ath9k/phy.h
@@ -419,6 +419,7 @@
 #define AR_PHY_CCK_DETECT_ANT_SWITCH_TIME           0x00001FC0
 #define AR_PHY_CCK_DETECT_ANT_SWITCH_TIME_S         6
 #define AR_PHY_CCK_DETECT_BB_ENABLE_ANT_FAST_DIV    0x2000
+#define AR_PHY_CCK_DETECT_BB_ENABLE_ANT_FAST_DIV_S  13
 
 #define AR_PHY_GAIN_2GHZ                0xA20C
 #define AR_PHY_GAIN_2GHZ_RXTX_MARGIN    0x00FC0000