wl1271: Add sysfs file to control BT co-ex state

Add a sysfs file to control the state of the BT co-ex (enable or disable it.)
By default, the BT co-ex is enabled.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Teemu Paasikivi <ext-teemu.3.paasikivi@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/wl12xx/wl1271_init.c b/drivers/net/wireless/wl12xx/wl1271_init.c
index d68445c..d9335fc 100644
--- a/drivers/net/wireless/wl12xx/wl1271_init.c
+++ b/drivers/net/wireless/wl12xx/wl1271_init.c
@@ -164,7 +164,7 @@
 	if (ret < 0)
 		return ret;
 
-	ret = wl1271_acx_sg_enable(wl);
+	ret = wl1271_acx_sg_enable(wl, wl->sg_enabled);
 	if (ret < 0)
 		return ret;