wl12xx: add band field to wlvif

add band field 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/wl12xx.h b/drivers/net/wireless/wl12xx/wl12xx.h
index fc8c975..a689ad0 100644
--- a/drivers/net/wireless/wl12xx/wl12xx.h
+++ b/drivers/net/wireless/wl12xx/wl12xx.h
@@ -591,6 +591,9 @@
 	u8 ssid[IEEE80211_MAX_SSID_LEN + 1];
 	u8 ssid_len;
 
+	/* The current band */
+	enum ieee80211_band band;
+
 	u32 bitrate_masks[IEEE80211_NUM_BANDS];
 	u32 basic_rate_set;