carl9170: use rx chainmask from eeprom

The eeprom provides a mask for all present rx chains.
Why not use it instead of the generic initval default?

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/carl9170/phy.c

@@ -532,8 +532,11 @@ static int carl9170_init_phy_from_eeprom(struct ar9170 *ar,
 	SET_VAL(AR9170_PHY_TPCRG1_PD_GAIN_2, val,
 		xpd2pd[m->xpdGain & 0xf] >> 2);
 	carl9170_regwrite(AR9170_PHY_REG_TPCRG1, val);
-	carl9170_regwrite_finish();
 
+	carl9170_regwrite(AR9170_PHY_REG_RX_CHAINMASK, ar->eeprom.rx_mask);
+	carl9170_regwrite(AR9170_PHY_REG_CAL_CHAINMASK, ar->eeprom.rx_mask);
+
+	carl9170_regwrite_finish();
 	return carl9170_regwrite_result();
 }