ath9k_hw: Fix STA connection issues with AR9380 (XB113).

XB113 (AR9380) 3x3 SB 5G only cards were failing to connect to APs
due to incorrect xpabiaslevel configuration. fix it.

Cc: stable@kernel.org
Cc: Ray Li <ray.li@greenwavereality.com>
Cc: Kathy Giori <kathy.giori@atheros.com>
Cc: Aeolus Yang <aeolus.yang@atheros.com>
Cc: compat@orbit-lab.org
Signed-off-by: NSenthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ar9003_eeprom.c

@@ -922,7 +922,7 @@ static const struct ar9300_eeprom ar9300_x113 = {
 		.db_stage2 = {3, 3, 3}, /* 3 chain */
 		.db_stage3 = {3, 3, 3}, /* doesn't exist for 2G */
 		.db_stage4 = {3, 3, 3},	 /* don't exist for 2G */
-		.xpaBiasLvl = 0,
+		.xpaBiasLvl = 0xf,
 		.txFrameToDataStart = 0x0e,
 		.txFrameToPaOn = 0x0e,
 		.txClip = 3, /* 4 bits tx_clip, 4 bits dac_scale_cck */