wl12xx: move rssi_thold and last_rssi_event into wlvif

move rssi_thold and last_rssi_event into the per-interface
data, rather than being global.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
diff --git a/drivers/net/wireless/wl12xx/main.c b/drivers/net/wireless/wl12xx/main.c
index fd2b9f2..72ab256 100644
--- a/drivers/net/wireless/wl12xx/main.c
+++ b/drivers/net/wireless/wl12xx/main.c
@@ -3497,7 +3497,7 @@
 						  bss_conf->cqm_rssi_hyst);
 		if (ret < 0)
 			goto out;
-		wl->rssi_thold = bss_conf->cqm_rssi_thold;
+		wlvif->rssi_thold = bss_conf->cqm_rssi_thold;
 	}
 
 	if (changed & BSS_CHANGED_BSSID)