wl12xx: add power_level field to wlvif

move power_level into the per-interface data.

mac80211 configures some values (e.g. band, channel)
globally, while we configure them per-interface.

In order to make it easier to keep track of the
configured value for each value while keeping sync
with mac80211, save these values both globally
and per-vif.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
diff --git a/drivers/net/wireless/wl12xx/init.c b/drivers/net/wireless/wl12xx/init.c
index 4af7e2f..74f5690 100644
--- a/drivers/net/wireless/wl12xx/init.c
+++ b/drivers/net/wireless/wl12xx/init.c
@@ -554,7 +554,7 @@
 		return ret;
 
 	/* initialize Tx power */
-	ret = wl1271_acx_tx_power(wl, wlvif, wl->power_level);
+	ret = wl1271_acx_tx_power(wl, wlvif, wlvif->power_level);
 	if (ret < 0)
 		return ret;