wl12xx: enable ELP mode

ELP mode is working now, let's enable it so that the firmware can sleep
and reduce power consumption.

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com>
Reviewed-by: Vidhya Govindan <vidhya.govindan@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/ps.c

@@ -85,11 +85,7 @@ static int wl12xx_ps_set_elp(struct wl12xx *wl, bool enable)
 	if (enable) {
 		wl12xx_debug(DEBUG_PSM, "sleep auth psm/elp");
 
-		/*
-		 * FIXME: we should PSM_ELP, but because of firmware wakeup
-		 * problems let's use only PSM_PS
-		 */
-		ret = wl12xx_acx_sleep_auth(wl, WL12XX_PSM_PS);
+		ret = wl12xx_acx_sleep_auth(wl, WL12XX_PSM_ELP);
 		if (ret < 0)
 			return ret;