rtlwifi: Remove extra workqueue for enter/leave power state

When the rtlwifi family of drivers was converted to use a workqueue when
entering or leaving power save mode (commits a269913c, a5ffbe0a,
41affd52, b9116b9a, and 6539306b), the code began scheduling work from
the callback routine of a different workqueue with a resulting increase in
overhead.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rtlwifi/base.c

@@ -1401,12 +1401,9 @@ void rtl_watchdog_wq_callback(void *data)
 		if (((rtlpriv->link_info.num_rx_inperiod +
 		      rtlpriv->link_info.num_tx_inperiod) > 8) ||
 		    (rtlpriv->link_info.num_rx_inperiod > 2))
-			rtlpriv->enter_ps = true;
+			rtl_lps_enter(hw);
 		else
-			rtlpriv->enter_ps = false;
-
-		/* LeisurePS only work in infra mode. */
-		schedule_work(&rtlpriv->works.lps_change_work);
+			rtl_lps_leave(hw);
 	}
 
 	rtlpriv->link_info.num_rx_inperiod = 0;