ath9k: Fix LED GPIO pin for AR9462

GPIO pin 4 is assigned AR9462 chipsets LED.
while GPIO pin 0 worked for obselete AR9462 chipsets though
they are meant for EEPROM as per Russell

Cc: Senthil Balasubramanian <senthilb@qca.qualcomm.com>
Signed-off-by: Russell Hu <rhu@qca.qualcomm.com>
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ath9k.h

@@ -462,7 +462,7 @@ void ath9k_btcoex_timer_pause(struct ath_softc *sc);
 #define ATH_LED_PIN_9287		8
 #define ATH_LED_PIN_9300		10
 #define ATH_LED_PIN_9485		6
-#define ATH_LED_PIN_9462		0
+#define ATH_LED_PIN_9462		4
 
 #ifdef CONFIG_MAC80211_LEDS
 void ath_init_leds(struct ath_softc *sc);